The Great Naval Battle of Ottawa

acoustical Admiralty American antenna anti-submarine April Argyle asdic British Canada Canadian Navy Canadian radar Captain centimetric radar chief of Naval chief of staff Commander Committee convoy corvettes Defence Degaussing destroyers DHist director of Naval Division established fitted frigates groups Halifax hedgehog Henderson HF/DF HMCS HMCS Chambly industrial July June liaison Macdonald Papers Mackenzie Diary major Marc Milner March McNaughton memorandum mid-ocean escorts military Millard minesweepers minister mounted National Research Council naval radar Naval Service Naval Staff Minutes Naval War Effort navy's Nelles NRC's NSHQ officers operational Ottawa P.M.S. Blackett Pressey problems production radar program Radio Branch RCN's refit River-class role Royal Canadian Royal Canadian Navy Royal Navy RX/C RX/U scientific scientists senior ships submarine sw2c swic technical ten-centimetre Tizard mission U-boat United Kingdom vessels Wallace wartime