Convoy ON 127

Convoy ON 127
Part of Battle of the Atlantic
HMCS Ottawa
Date 9–14 September 1942 Location North Atlantic Result German tactical victory
Belligerents
United Kingdom Canada	Germany
Commanders and leaders
RADM Sir E O Cochrane KBE LCDR A.H. "Dobby" Dobson RCNR[1]	Admiral Karl Dönitz
Strength
35 freighters 4 destroyers 4 corvettes	13 submarines
Casualties and losses
6 freighters sunk (44,113GRT) 24 killed/drowned 1 destroyer sunk 114 killed/drowned

Convoy ON 127 was a trade convoy of merchant ships during the second World War. It was the 127th of the numbered series of ON convoys Outbound from the British Isles to North America and the only North Atlantic trade convoy of 1942 or 1943 where all U-boats deployed against the convoy launched torpedoes.^[2] The ships departed Liverpool on 4 September 1942^[3] and were met at noon on 5 September^[1] by the Royal Canadian Navy Mid-Ocean Escort Force Group C-4 consisting of the Canadian River-class destroyer Ottawa and the Town-class destroyer St. Croix with the Flower-class corvettes Amherst, Arvida, Sherbrooke, and Celandine.^[4] St. Croix's commanding officer, acting Lieutenant Commander A. H. "Dobby" Dobson RCNR, was the senior officer of the escort group.^[1] The Canadian ships carried type 286 meter-wavelength radar but none of their sets were operational.^[5] Celandine carried Type 271 centimeter-wavelength radar.^[5] None of the ships carried HF/DF high-frequency direction finding sets.^[5]