On patrol 21 May, awaiting the departure of the convoy on its return voyage, Nields received a submarine contact report from a British observation plane and immediately headed for the area. At 1716 Nields established sound contact. At 1718 she dropped a pattern of 9 depth charges. At 1723 sound contact was regained and another 9 charge pattern was fired. At 1731 and at 1741, further charges were fired from her "K" guns, forward and port. Within seconds of the last attack, oil patches were observed. Italian submarine Gorgo, one of two such submarines to be sunk by American forces, had gone to the bottom of the Mediterranean. The other Italian submarine downed was the Argento, sunk by the USS Buck DD420.
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