Convoy ON 166

Convoy ON 166
Part of Battle of the Atlantic
A depth charge being loaded onto a depth-charge thrower aboard the corvette HMS Dianthus
Date 20–25 February 1943 Location North Atlantic Result German tactical victory
Belligerents
United Kingdom  United States  Canada Poland	Germany
Commanders and leaders
CAPT W E B Magee RN CAPT P.R. Heineman USN	Admiral Karl Dönitz
Strength
63 freighters 1 destroyer 2 cutters 5 corvettes	18 submarines
Casualties and losses
14 freighters sunk (87,994 GRT) 262 killed/drowned	3 submarines sunk 128 killed/drowned 11 captured

Convoy ON 166 was the 166th of the numbered ON series of merchant ship convoys Outbound from the British Isles to North America. Sixty-three ships departed Liverpool 11 February 1943 and were met the following day by Mid-Ocean Escort Force Group A-3 consisting of the Treasury-class cutters Campbell and Spencer and the Flower-class corvettes Dianthus, Chilliwack, Rosthern, Trillium and Dauphin.