During the remainder of her assignment at Queenstown, "Winslow" attacked two more submarines, the first on 11 October and the second on 3 January 1918. In both cases, she depth-charged oil slicks which appeared to originate from damaged, submerged U-boats. In neither case did she receive visible confirmation of a sinking; however, during the 3 January attack, one of her depth charges threw a large mass of dark liquid high in the air. From this description, it appears that her depth charge brought up fuel oil from what was believed to be . Unfortunately for "Winslow", lack of definite proof kept her from being credited with a sinking.