On June 4, 1944, U.S. forces were able to capture a German submarine off the African coast because they had broken the Enigma code and learned a sub was in the vicinity. On the eve of D-Day, the U.S.

An Enigma machine at the Mimms Museum of Technology and Art. © An Enigma machine at the Mimms Museum of Technology and Art. © Mimms Museum of Technology and Art, CC ...