German submarine U-34 sank British destroyer Whirlwind off Land's End, southwestern tip of England, United Kingdom. 50 miles southwest of Ireland, U-34 torpedoed British destroyer HMS Whirlwind, killing 59; 51 survivors were rescued by destroyer HMS Westcott before Wescott scuttled Whirlwind. Also off Ireland, U-99 damaged Canadian steamer Magog, breaking her into two; the stern section sank immediately, but the remainder of the ship remained afloat largely due to the timber she was carrying; 23 survivors were rescued by Swedish merchant ship Fidra.
