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Chapter 1
Footnotes
a. The term U-boat is used to refer to any enemy submarine (German, Italian, Vichy French, or Japanese) with a displacement of 200 tons or more.
b. The estimates given here for U-boat sinkings are based on Allied assesments. Incidents assessed A or B are considered to have sunk the U-boat. Justification for this assumption is given in Appendix I.