On board the flagship Nagato in Saeki Bay, on 5 November 1941
Commander in Chief of the Combined Fleet Yamamoto, Isoroku
The operations of the Combined Fleet against the United States, Britain and the Netherlands will be conducted in accordance with the separate volume.
Combined Fleet Top Secret Operational Order No 1 separate volume.
Operations of the Combined Fleet against the United States, Britain and the Netherlands.
 As the order is extensive in scope, details have been omitted and only the essential points are given, with some explanation.
Part I. Operation of the Combined Fleet in Case of War with the United States, Great Britain and the Netherlands Begins during the China Operations. Chapter I. Outline of operations Chapter II. Preparations to Open War and the Commencement of Hostilities. Section 1. Preparations to Open War Section 2. Commencement of Hostilities and the Authorized Use of Arms. Chapter III. The First Phase Operations Section 1. Operational policy Section 2. Outline of operations against the US Fleet Section 3. Outline of Southern Operations Section 4. Operation Periods Section 5. Disposition of Forces Chapter IV. The Second Phase Operations Section 1. Operational Policy Section 2. Key Points to Defend in Occupied Areas and Advance Bases Section 3. Areas Designated for Occupation or Destruction Section 4. Disposition of Forces Chapter V. Protection of Surface Lanes, Interruption of Enemy Surface Lanes, and Mine Warfare Section 1. Protection of Surface Lanes Section 2. Operations to Interrupt Surface Lanes Section 3. Mine Warfare 78 Chapter VI. Communications Chapter VII. Supply Chapter VIII. Operations to be Performed by Forces Other Than the Combined Fleet Section 1. Operations of the Forces of Each Naval District and Minor Naval District. Section 2. Operations of the China Area Fleet Part II. Operations of the Combined Fleet in Case War with Russia Begins during the War with the United States, Great Britain, the Netherlands and China Chapter I. Operational Policy Chapter II. Disposition of Forces Chapter III. Operations to be Executed by Forces Other Than the Combined Fleet Section 1. Operations of the Forces of Each Naval District and Minor Naval District. Section 2. Operations of the China Area Fleet Part III. Miscellaneous Rules Chapter I. Time to be Used Chapter II. Charts to be Used Chapter III. Identification of Friendly and Hostile Forces
1. In the east the United States Fleet will be destroyed and United States lines of operation and supply lines extending toward the Far East will be cut.
2. In the west, British Malaya will be invaded and the Burma route, British lines of operations and supply lines extending toward the east will be cut.
3. The enemy forces in the Orient will be destroyed and enemy bases of operations and areas rich in natural resources will be captured.
4. A structure for sustained warfare will be established by capturing and exploiting strategic points and by strengthening defense.
5. The enemy forces will be intercepted and crushed.
6. Battle successes will be exploited, thereby destroying the morale of the enemy.
(Note: The above outline was generally based on operational policy of the Naval General Staff and, therefore, requires no elaboration. However, the plan to destroy the
United States Fleet in the east indicated a strong intention to conduct operations in the Hawaiian area). 
 Notes in parentheses were not in the original notations but were added as explanations for clarity
Section 1. Preparations to Open War
1. In case our Empire decides to complete operational preparations in anticipation of a war with the United States, Britain and the Netherlands, "First Preparations for War" will be issued together with the announcement of the tentative date on which the operation is to be started (Y Day).
(Note: At the time this order was being drafted it was impossible to tell when the Imperial General Headquarters and the Government would reach a decision on whether or not to go to war or when an Imperial General Headquarters Navy Order would be issued which would explain how operational preparations should be made and what their deadlines would be. In view of this fact, the Combined Fleet issued its own instructions such as "First Preparations for War" and gave its own designations, such as "Y Day.")
Accordingly, each force will act as follows:
a. Without special orders, all fleets units will shift into the new organization and complete battle preparations in accordance with the disposition of forces for First Period Operations of First Phase Operations and then, as directed by their respective commands, will advance to designated point at a proper time where they will ready themselves for action.
(Note: The points for stand-by were designated in accordance with the Army-Navy Central Agreement or were determined by the Combined Fleet in accordance with the dispositions of its forces. They were not points of deployment and were generally designated within the Homeland, the Inner South Seas, Formosa and Hainan Islands.)
b. Each force will take strict precautions against any surprise attack which may be made by the forces of the United States, Britain, or the Netherlands.
(Note: There was a great possibility that the enemy would initiate the attack. Later, an Imperial General Headquarters Navy Order was issued stipulating in concrete terms the scope of armed resistance to be offered.)
c. The commanding officers of each force is authorized to conduct secret reconnaissance only when required especially by the operational situation.
(Note: In view of the urgent situation, Imperial General Headquarters gave the Combined Fleet permission to conduct secret reconnaissance)
d. Pursuant to defense plans, 4th Fleet will begin to lay mines around the South Sea Islands at the prescribed time.
2. In case the advance forces necessary for carrying out the operations have to advance to the operational areas, "Second Preparations for War" will be issued and each force will act as follows:
a. The Submarine Force, Carrier Striking Force, the Commerce Raider Force, the Submarine Group of the Southern Force and the South Seas Force, will depart for the operational area at the time designated by the commanders of the respective forces.
b. All other forces will operate under the command of their respective commanders in conformity with the combat disposition for the outbreak of war.
(Note: By "departure for the operational area" was meant the deployment of forces. It did not mean that permission had been give for use of arms. Operational forces, which were organized in accordance with the disposition of forces determined by the Combined Fleet, were given such designations as Submarine Force, Carrier Striking Force, etcetera, according to their operational missions; therefore, they were different from the forces in the original naval organization.)
3. If the situation requires, certain forces will ordered separately to make necessary preparations for operations. Also, if a great change occurs in the situation , "Second Preparations for War" may be superceded by "First Preparations for War".
(Note: The purpose of the above preparational order was to indicate to each force that its advance to the operational area in accordance with "Second Preparations for War" did not necessarily mean that the force was to commence hostilities. Imperial General
Headquarters had unofficially instructed the Combined Fleet to withdraw its forces from the operational waters in case of a successful conclusion of the Japanese-American negotiations which were then under way.)
Section 2. Commencement of Hostilities and the authorized use of arms.
1. The time to open war will be designated as X Day, by the Imperial Order (the order will be given several days in advance). From 0000 hours X Day, hostilities will commence and each force will operate as scheduled.
(Note: Imperial General Headquarters expected that the time for the projected attack on Pearl Harbor would be just after sunrise at Pearl Harbor, 030 hour Tokyo time, on X Day, and that an advance landing force would approach the shore of Malaya much later. Consequently Imperial General Headquarters did not expect that hostilities would be opened immediately after 0000 hours on X Day and even an Imperial General Headquarters Navy Order, which was issued later, roughly stated that X Day was 8 December. The Combined Fleet fixed the time strictly as action could be taken after 0000 hours. Although it was after 0000 hours, X Day, the landing at Kota Bharu was realized earlier than scheduled and was the first battle of the Pacific War.)
2. If case the enemy initiate a serious attack before X Day, the following measures will be taken:
a. Forces which are attacked, will counterattack at once. However, offensive counterattack by a base air force before the announcement of X Day will be launched only by Imperial command.
b. After X Day is announced, all forces will open hostilities and begin operations without special orders.
c. Prior to the issuance of the X Day order, the outbreak of war will depend on Imperial command.
3. After "Second Preparations for War" is issued, use of arms is authorized only when it is inevitable, as in the following cases:
a. When vessels or aircraft of the United States, Great Britain, or the Netherlands approach our territorial waters and their movement seems to create a danger.
b. When our forces maneuvering outside our territorial waters are threatened by an aggressive movement of any of the forces of the above-mentioned countries.
(Note: This item was issued with the approval of the Imperial General Headquarters by the Commander in Chief of the Combined Fleet in order to cope with any unexpected attack by the enemy. An advance to the operational waters was ordered by Imperial General Headquarters Navy Order No 5 dated 21 November and, at the same time, definite instructions were given in Imperial General Headquarters Navy Directive No 5 as to how the meet the enemy's challenge.)
Section 1. Operation policy
1. The Advance Expeditionary Force, the Carrier Striking Force, the South Seas Force, the Northern Force and the Main Force will operate against the United States fleet.
2. The Submarine Force and Carrier Striking Force (Note: Matters pertaining to those forces were left blank in the general order and the details were given only to the forces concerned. The plan was that the Submarine Force and the Carrier Striking Force would launch a surprise attack on the United States Fleet in the Hawaii area at the outbreak of war. This plan to attack Pearl Harbor was kept so secret that it was not revealed to the other forces even in the Combined Fleet.)
The South Seas Force will capture or destroy key points in the vicinity of its assigned area, meanwhile preparing against any enemy fleet operating from the Australian area.
The Northern Force will guard against Soviet moves.
3. The Southern Force, maintaining local superiority, will mop up or annihilate enemy fleets operating in the Philippines, British Malaya and Netherlands East Indies Area. At the same time it will co-operate with the Army as follows:
a. The force will commence operations simultaneously against British Malaya and the Philippines, launching an initial air
on surface and air power in these areas and repeating attacks thereafter. The force will also land Army advance forces on strategic points of Malaya, the Philippines and then British Borneo. The Air Force will be advanced to intensify air operations.
b. With the success of the above-mentioned operations, the main body of the Army invasion forces will be landed in the Philippines and then British Malaya, and occupy these areas as quickly as possible.
c. In the early stages of the operations the force will occupy the strategic areas of the Celebes, Dutch Borneo and Southern Sumatra in that order, and, at the opportune time, will occupy the key points of the Moluccas and Timor Island and establish necessary air bases.
d. Immediately after the establishment of the above air bases, the Air Force will advance and neutralize the enemy air power in the Java area. After the enemy air power has been neutralized, the main body of the Army invasion force will land on Java Island and occupy it.
e. After occupying Singapore, this force will capture the key points of northern Sumatra. It will also operate against BURMA at an opportune time and cut off the enemy supply route to China.
4. In case the United States attempts to attack, it will
be intercepted by the main strength for a decisive battle, while the Southern Operations will be conducted temporarily by the 3rd Fleet, and the Southern Expeditionary Fleet.
5. And element (the 24th Converted Cruiser Division) of the Combined Fleet will disrupt enemy surface lanes in the Pacific Ocean and the Indian Oceans at the proper time.
6. Utmost efforts will be exerted to make Thailand and French Indo-China sympathetic to our cause instead of arousing their animosity. Should they become hostile towards us and obstruct our operations, however, armed force will be employed to suppress them.
Section 2. Outline of Operations against the United States fleet
The following are the classification and outline of operations against the United States Fleet:
Each force will operate according to the classification of operations shown on Chart I.
3. Outline of Southern Area Operations
Excepting those operations to be specially carried out in accordance with the operational policy issued by Imperial Navy Directive or by agreement between Commander in Chief of the Combined Fleet and the Commander in Chief of the Southern Area Army the Southern Operations will carried out by the commander of the Southern Force.
Section 4. Operations periods
The periods of the first phase operations will be classified as follows. Any shift of period will be by special order.
a. The first period operations
Operations to be executed from the outbreak of war until about the completion of the landing of the main body of the Army invasion for in the Philippines.
b. The second period operations
Operations to be executed from the end of the first period operations until the approximate completion of the landing of the main body of the Army invasion force in British Malaya.
c. The third period operations
Operations to be executed from the end of the second period operations until the Netherlands East Indies are practically occupied.
Section 5. Disposition of Forces
1. Disposition of forces during the first phase operations will be as shown in Separate Chart No 1.
2. Disposition of forces during the second phase operations phase operations will be as shown in Separate Chart No 2.
3. Disposition of forces during the third phase operations will be as shown in Separate Chart No 3.
4. Disposition of forces for interception operations will be as shown in Separate Chart No 4.
Separate Chart 1
Disposition of Forces during the First Period Operations of the First Phase Operations (From the First Preparations for war until the Completion of Landing of the Main Force in the Philippines, namely, until X+30 day.)
Separate Chart 2
Disposition of Forces during the Second Period of Operations of the First Phase of Operations (Until the completion of landing upon British Malaya by the main strength of Army's Invasion Force, or about X+40 day
Separate Chart 4
Disposition of Interception Operations
Section 1. Operational policy
1. The Advance Expeditionary Force will continue to make reconnaissance raids on the United States and British fleets. These fleets will be attacked by base air forces, carrier air forces, etc., at opportune times.
2. Anglo-American lines of operation and supply lines to the Orient will be severed, and the defenses of strategic areas will be strengthened.
3. Enemy forces in the waters under our control and remnants of the enemy force in occupied strategic areas will be mopped up, in order to secure resources and protect sea lanes.
4. If and when the United States and British fleets attack, take advantage of interior lines and defeat the enemy individually.
5. Intensify operations to disrupt American and British sea lanes of communication.
Section 2. Key points to be Defended and Advance Bases
(Note: Since this section is the same as that shown in operational policy of Imperial General Headquarters, Navy Section, it is omitted.)
Section 3. Areas Designated for Occupation or Destruction
The following areas will be occupied or destroyed as soon as the operational situations permits:
a. Eastern New Guinea, New Britain, Fiji and Samoa areas
b. Aleutians and Midway areas
c. Andaman Islands area
d. Strategic points in the Australia area.
Section 4. Disposition of forces
The disposition of forces for Second Phase Operations has been decided as shown in Separate Chart No 5. However, the disposition of forces for the interception operations will be based on Separate Chart No 4.
Section 1. Protect of Surface Lanes
Besides the following plan, surface lanes will be protected in accordance with the direction of each force commander, based on the 1941 Wartime Commerce Protection Plan.
(Note: The annual Commerce Protection Plan was drawn up by the Naval General Staff at the same time as the operations plan was drafted. The plan chiefly concerned commerce protection regulations for naval districts and minor naval districts. Overseas commerce protection was the responsibility of the outer combat forces, and the plan was part of the operations plan.)
Section 2. Operations to Interrupt Surface Lanes
1. Operational Policy
Operations to interrupt surface lanes will be executed immediately against vital communication lanes of the United States, Britain and the Netherlands. These operations will facilitate the execution of the main operations by checking enemy forces. They will be intensified and continued for as long as necessary, so as to destroy the enemy's fighting will.
2. Operating procedure.
a. Capture hostile ships at the outset of war
By keeping close contact with the Imperial General Head-
Assigned Area of Overseas Commerce Protection
quarters and inner Defense Force, hostile ships will be captured and detained insofar as the action does not interfere with the main operations. The sector assigned to each force for observation and seizure of ships is about the same as that explained in Section 1.
b. The Commerce Raiding Unit will leave the South Seas area at an opportune time, as directed by the commander, and upon the outbreak of war will operate between South and Central America and Australia and along the west coast of South America, to harass surface transportation, and, depending upon the situation, elements will operate between Australia and Africa, and in the Indian Ocean areas.
c. According to the progress of the operations, less than one submarine division of the Submarine Force, as designated by the commander, will maneuver east of Hawaii and off the west coast of Central and North America as long as this action does not hamper the main operations. At the same time, the Hawaii Area Force will engage in interrupting the supply lines to Hawaii whenever opportunity arises.
d. After the First Period Operations of the First Phase Operations, elements of the 4th, the 5th and the 6th Submarine Squadrons, as designated by the Southern Force commander, will engage in interrupting surface traffic near the southern coast of Java or the western entrance of Malacca Strait. Upon conclusion of the
Southern Operations, they will again actively engage in cutting surface lanes in the Indian Ocean and the Australian area.
e. When the First Phase Operations have been completed or when opportunity offers in the course of the operations, commerce raiding will be further strengthened by surface craft and airplanes, and will actively engage in the disruption of sea lanes.
(Note: By Imperial General Headquarters Navy Directives Nos 15 and 16, dated 30 November 1941, the Combined Fleet and the China Area Fleet were given instructions on "Operations Policy for the Interruption of Sea Lanes", and each Naval District and Minor Naval District was shown the "Policy on the Treatment of Enemy and Neutral Vessels.")
Section 3. Mine warfare
Mine warfare by the Combined Fleet will be performed according tot he following plans and will be directed by the respective force commander:
1. Southern area of operations
a. Standard for the execution of offensive mine warfare is as indicated in Appended Chart No 1.
b. Standard list of bases to be protected by mines and antisubmarine nets is as indicated in Appended Chart No 2.
c. List of supply of mines and antisubmarine nets is as
Appended Chart No 1.
Standard for the Execution of Offensive Mine Warfare in the Southern Operational Area
Appended Chart No 2.
List of Bases to be Defended by Mines and Antisubmarine Nets
indicated in Appended Chart No 3. (Omitted)
d. Outline for establishing mine barriers after the conclusion of the Southern Operations is as indicated in Appended Chart No 4.
2. South Seas Area
Offensive mining operations in the South Seas area will be executed in accordance with directions of the South Seas Commander based on the defense plan of the 4th Fleet.
3. Whenever a force has laid or cleared mines, its commander will notify the locations of mines, navigable sectors, etcetera, to the authorities concerned.
4. Announcement of laying of mines
The main purpose of announcing mine laying is to frighten the enemy. Announcements will be regulated Combined Fleet Headquarters and will be made by Imperial General Headquarters.
List of Supply of Mines and Anti-submarine Nets (Omitted)
When the Southern Operations have come to an end, mine barriers will be laid to secure the South China Sea and facilitate sea escort duties in accordance with the following plan. However, these operations will decided by later orders.
Sea to be Number of Strength to be Remarks Mined Mines Employed --------------------------------------------------------------------- Karimata 9th Base Force Purpose is to prevent and 5,000 Elements of the infiltration of enemy Gaspar 17th Minelayer submarines Straits Division --------------------------------------------------------------------- Sunda 600 2d Base Force Purpose is to prevent Strait infiltration of enemy submarines, intensify- ing first mining opera- tion --------------------------------------------------------------------- Malacca 1,000 9th Base Force Same as the above Strait ---------------------------------------------------------------------
The operational communications of the Combined Fleet will be conducted in accordance with the following procedure, which will be governed by the Combined Fleet Radio Communications Regulations , and the Army-Navy Central Agreement on Communications in the Southern Operations  (See Charts 2 and 3 for communications instructions at commencement of hostilities. The time chart for operations is given in Chart 4.)
1. The internal communications of the operational force will be conducted chiefly by means of broadcast. In cases where it is uncertain that the broadcast has been received or when an important message is broadcast, confirmation of having heard the broadcast will be required.
2. Each force will be attached to the short distance communications net (long distance communications net if necessary) of the nearest land-based communications unit as designated by its commander.
 Monograph No 118, Operational History of Naval Communications, Dec 14-Aug 45, P. 14.
 Monograph No 118, Operational History of Naval Communications, Dec 14-Aug 45, P. 136.
Ship, Aircraft and Submarine Communications
Communications Unit (Base) Communications
--------------------------------------------------------------------- Classification of Communications Commencement Time --------------------------------------------------------------------- Communications Unit 0000 hours X minus 7 day Communications --------------------------------------------------------------------- Ship communications 0000 hours X minus 5 day Submarine communications --------------------------------------------------------------------- Aircraft communications 0000 hours X minus 2 day --------------------------------------------------------------------- Special Forces Communications Special order --------------------------------------------------------------------- Note: After 0000 hours X minus 2 day, the Second China Expeditionary Fleet and the Hainan Guard District will be assigned to the ship communications net until further notice. Remarks: 1. When a force is required to commence communications disposition before the date shown in this chart, the commander of the force con- cerned will designate the date and notify the proper parties. 2. Commencement time of part of the force will changed by special orders. ---------------------------------------------------------------------
Communications concerning transportation, supply, personnel and other matters which do not require immediate attention from the operational standpoint will be conducted through this communications net. However, task force and commerce raiding units which conduct long-range operations for special duty will be attached to the special communications net and communicate with the Tokyo Communications Unit after leaving the standby base.
3. Each land-based communications unit will relay communications of the operational force in the area concerned to the proper parties as stipulated in Chart 5. As a standard procedure, the relay will be conducted by broadcast and the acknowledgment of the messages will be required when confirmation of transmission is necessary. Communications with higher priority than emergency will be relayed immediately.
4. Each communications unit will broadcast radio messages of operational importance in accordance with Chart 6. In order to conduct the communications in the area concerned, each force commander will utilize the broadcast communications of the land-based communications unit. Each force will receive the broadcast as designated by its commander.
5. When the main force is located within Japanese waters, the Flagship of the Combined Fleet will conduct remote control of the transmitters of the Tokyo Communications Unit (or the Kure Communications Unit), or will direct the Tokyo Communications Unit to conduct
communications in the name of the Flagship, Combined Fleet.
6. With the exception of special emergency messages, communications with other forces will be conducted through the communications net of the nearest land-based communications unit.
1. Frequency Security
a. The Combined Fleet Top Secret Order No 177 (Standing Order for Radio Silence During Operations) well be applicable.
2. Message Security
a. Code books and call signs will be based on the following orders:
Combined Fleet Top Secret Order No 171
(Guide for Use of Code Books)
Combined Fleet Top Secret Order No 52
(Combined Fleet Wartime Special Call Sign Chart)
Combined Fleet Top Secret Order No 169
(Strategic Communications Abbreviation Codes)
Combined Fleet Top Secret Order No 179
(Combined Fleet Special Operations Communications Unit Priority Classification Code Chart)
b. Message authentication and categorized deceptive message system will be based on:
Combined Fleet Top Secret Order No 49
(Combined Fleet Categorized Deceptive Message Security System.)
c. Date indication system will be based on:
Combined Fleet Top Secret Order No 51
(Combined Fleet Special Military Date Indication Code Chart)
d. Place Indication System: See Chart 7.
1. The radio intelligence group assigned to the Fleet will utilize enemy communications in accordance with the directives of the C in C of each fleet.
2. The radio intelligence group assigned to the land-based will utilize enemy communications as shown in Chart 8.
3. Unless otherwise ordered, the interference of enemy communications will be conducted in accordance with the directives of the unit commander.
4. When known to be effective, the unit commander (the 1st Combined Communications Unit commander) will direct the nearby communications unit (subordinate communications unit) to carry out interference of enemy communications.
Place Indication System
Utilization of Navy Air Strategic Point Code Chart
(Navy Ministry, Secret No 167)
Section 1. Supply Policy
1. As a rule, a ship need not be refueled until its fuel load drops to 60 per cent of its fuel-carrying capacity. However, when a battle is anticipated every effort will be made to maintain capacity.
2. Ordnance, ammunition, bombs, rations and other necessary supplies must be replenished to capacity at every opportunity.
Section 2. Outline of Supply.
1. The bases of operations during the first phase of the war have been generally designated at follows:
For the 4th, 5th, and 6th Fleets - Yokosuka
For the 1st and 2d Fleets, the 1st Air Fleet and the vessels and units directly attached to the Combined Fleet - Kure
For the 11th Air Fleet, the Southern Expeditionary Fleet and the 3d Fleet - Sasebo
2. Bases of operations and supply bases for supply ships attached to each force have been generally designated as follows:
For the Main Force, Carrier Striking Force, Submarine Force, South Seas Force - Yokosuka, Kure and their vicinity
For the Southern Force - Mako, Takao, Sasebo and their vicinity.
For the Northern Force [date missing, PHWG]
For Commerce Raiding Force - Suitable place.
3. Supply bases have been generally designated at follows: (omitted)
4. With the progress of operations, special supply bases will be newly established in the occupied areas. They will come under the control of the local force commander. (The rest is omitted)
5. As a rule, the forces will be supplied from supply ships attached to them.
Items from 6 to 10 are omitted.
Section 3. Supply Duties
Section 4. Replenishment of Supply Ships and Supply Bases
Section 5. Security Measures for Supply Ships
Various appendices concerning supplies
Section 1. Operations of the Forces of Each Naval District and Minor Naval District
1. Strengthen the defenses of strategic points, secure surface traffic and cooperate with the Combined Fleet and the China Area Fleet in executing operations in the districts assigned to each force.
2. In accordance with the change in the situation, advance the air forces and other necessary forces to the areas requiring reinforcement and put these forces under the operational command of the commander in chief of the fleet concerned, or of the commanding officer of the force of the naval district or the minor naval district in that area.
Section 2. Operations of the China Area Fleet
1. Continue operations against China with in the present strength. Destroy the military forces of the United States and Great Britain in China.
2. At the outbreak of war, invade Hongkong with the forces formed around the 2d China Expeditionary Fleet, maintain cooperation with the Army, and destroy the local enemy troops.
3. Strengthen the defenses and fortifications of the occupied areas, secure the sea traffic along the China coast and prevent enemy
ships and airplanes from using the China coast.
4. If necessary, cooperate with the Combined Fleet and Southern Army in escorting sea transports of the Army and in protecting assembly points.
1. The operations against the United States, Great Britain and Holland will be continued in accordance with the operational policy described in Part I.
2. The operational policy against Russia will be as follows:
a. In case war with Russia begins during First Phase Operations:
(1) First assume passive defense, chiefly with the 5th Fleet and Inner Combat Forces, secure the main coastal traffic of the Homeland and protect the strategic areas from enemy air raids.
(2) Thereafter, as far as Southern Operations and the operations against the United States Fleet permit, quickly divert elements of the light forces and the air forces as reinforcements to the operations against Russia.
b. In case war with Russia begins after the conclusion of the First Phase Operations.
(1) Shift the greater part of the 5th Fleet and an element of the light vessel forces to the operations against Russia, and, as soon as possible, destroy the Russian fleet in the Orient in order to gain control of the waters surrounding the Far Eastern territory of Russia.
(2) At the same time, in cooperation with the Army, destroy hostile air forces in the Maritime Province of Siberia and Ussuri Oblast and invade Vladivostok and other strategic points of the Far East.
Section 1. Operations of the Forces of Each Naval District and Minor Naval District
1. The naval stations at Yokosuka, Kure, Sasebo and Maizuru and the minor naval districts at Ominato, Chinaki and Port Arthur particularly will strengthen the defense against Russian submarines and airplanes and will destroy them should they appear in the vicinity of the assigned areas.
2. In case the Outer Combat Forces become actively engaged in operations, the air forces and other necessary forces of naval districts and minor naval districts will be assembled in strategic points and assist in the operations.
Section 2. Operation of the China Area Fleet
Cover the movements of the Army forces which will be diverted from Central and Northern China with the naval forces formed around the 1st and 3d China Expeditionary Fleets, and reorganize the front power in accordance with the situation.
Central Standard Time will be used.
The following charts (grid charts) will be used:
Navy Ultrasecret 347 grid chart of the Pacific Ocean for ordinary naval operations.
Special grid chart for joint Army-Navy operations and local operations.
The identification of friendly and enemy forces will be based on Combined Fleet Doctrine and the following:
Actual Identification between naval ships, Japanese vessels (including transports and Army vessels), and Army and Navy land facilities (including troops) will be based on "Signal Regulations for Wartime Identification of Japanese Ships (in even numbered months Method No 1 will be followed, and in odd-numbered months Method 2 will be followed). Airplanes will be identified in accordance with the "Army-Navy Joint Agreement Concerning Recognition of Friendly Planes.")
Disposition of Forces during the Second Phase Operations (after the conclusion of the first phase of operations in the south)
(Note: Omitted because, in general, it is the same as the disposition for Interception Operations.)
Chapter VI. Communications
Chapter VII. Supply
(Note: There were many supplementary revisions, but they are omitted)
Appendix No 1. Initial storage of supplies in supply bases and specially established supply places
Appendix No 2. Disposition of supply vessels
Appendix No 3. The positions in readiness and future movements of the supply vessels of the Attached Force of the Combined Fleet
Appendix No 4. Monthly replenishment of supplies in the supply bases and specially established supply places