...
The Canadian Examination Unit, under the leadership of noted American cryptanalyst Herbert Osborne Yardley of The American Black Chamber infamy, commenced operations in June 1941 with a very small inter-departmental staff of nine (on loan to the unit were personnel from the N.R.C., the Army, Cable Censorship, the Post Office Department, and the RCMP). 22 Interestingly, in order not to raise the ire of U.S. or British SIGINT organizations of the day, Yardley worked in Canada under the name Herbert Osborne (he was reviled and still much maligned by the U.S. and Britain for disclosing SIGINT secrets in his 1931 book). Yardley's employment was ultimately terminated after six months, once both countries found out that he was working for the Canadian cryptanalytic cause and pressured Canada - on the overt threat of breaking rapidly expanding SIGINT relationships - for his removal. 23 Thus in mid-1941 began the close working relationship between the External Affairs-controlled Examination Unit and the Canadian Army. Aside from Army personnel who were seconded to the unit Army Special Wireless Stations and, later in the war, listening sites of the RCN and RCAF, provided intercepted traffic - initially German 'illicit', then Vichy French and Japanese - to the Examination Unit, who analyzed (e.g. decrypted, translated) the material and were thus able to feed "a continuous stream of intelligence to the Department of External Affairs and to the Directors of Intelligence." 24..
