Enemy submarines became more active off West African coast according to the U.S. Joint Intelligence Committee. Daily summary dated 18 August 1942

An item reported that enemy submarines seemed more and more to be active off the West African coast especally in the vicinity of Freetown, Sierra Leone.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 251 dated 18 August 1942.