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I’ll have more time to look after church, but I’ve run down the British and German numbers.

Britain had 38 subs overall.

“At the end of August the total German strength in U-boats was fifty-six, but ten of them were, for various reasons, not fully operational. Of the total of completed boats eight were of about 700 tons displacement and capable of operating as far as Gibraltar or the Azores; eighteen were smaller ocean-going boats of 500 tons which could reach out into the Atlantic as far as 15° West or work off the coasts of Spain or Portugal, and thirty were small 250-ton boats which could only be used in the North Sea and in British coastal waters.”

France had 53 in the Med, 4 for the south Atlantic operating out of Morocco, and 2 in the far East (Vietnam, if I recall from earlier reading)

All: http://www.ibiblio.org/hyperwar/UN/UK/UK-RN-I/UK-RN-I-4.html

I’ll look for Russia and Japan later.