3 December 1941
Judging from all indications, we feel that some joint military action between Great Britain and the United States, with or without a declaration of war, is a definite certainty in the event of an occupation of Thailand.
JD-1: 7098 (D) Navy Trans. 12-5-41 (7)
(EXHIBITS OF JOINT COMMITTEE , EXHIBIT NO. 1 INTERCEPTED DIPLOMATIC MESSAGES SENT BY THE JAPANESE GOVERNMENT BETWEEN JULY l AND DECEMBER 8, 1941)