 Following the collapse of France in 1940 for example, the RCN continued to monitor French naval frequencies at Britain's request in order to determine the fate of the French fleet.German communications intercepted by the Canadians also "helped the British in mounting" their "successful attack on" the famous battle-cruiser "Bismarck" in May 1941.In May 1943, as well as receiving the Intelligence summaries issued by Whitehall to the naval commands at home and overseas, the (radio interception) Tracking Room in Ottawa began to receive a full series of Enigma decrypts.