Enemy submarines coming or going between Europe and Western Atlantic Ocean according to the U.S. Joint Intelligence Committee Daily summary dated 6 May 1942

An item reported that in the west part of the Atlantic Ocean an unusually large proportion of enemy submarines were going of coming from Europe.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 147 dated 6 May 1942