From WILL - World War II Central Illinois Stories -

Oral History Interview: Margaret Henderson of Urbana

Margaret Henderson was a senior at Radcliffe when the U.S. Navy became so desperate for communications officers that it recruited several senior girls to train to become cryptologists. German U-boats were disrupting shipping to a great degree so the Navy needed help. Henderson trained for 30 days at Mt. Holyoke and then went to Washington, D.C. where she worked from 1943-45 in Naval Communications Intelligence for the European theater. In her office, Allies read communications in which German U-boat officers were wiring each other their positions, unaware that the Allies had broken their code. One of Henderson’s jobs was to keep track of the U-boats using a big map and pins.