USCGC Campbell (WPG-32) at Argentia winter 1942

The U.S. Coast Guard cutter USS Campbell (WPG-32) at Argentia, Newfoundland, sometime in late-1942 or early 1943. Note the HF/DF mast on her poop deck. The Campbell, along with Spencer, were the first U.S. warships equipped with this important device, pioneered by the Royal Navy for the fight against Germany's U-boat fleet. The escort commander somehow obtained two modified FH3 HF/DF sets, named "Type DAR", from the British and had them mounted on Campbell and Spencer. The success of this equipment, and its pioneering use by the U.S. Coast Guard, in defeating the U-boats cannot be overestimated. They were also fitted out with radar and in combination with huff-duff these escorts began to shift momentum of the convoy battles in their favour.