17 Dec, 1941
The German submarine U-131 was sunk north-east of Madeira, Portugal, in position 34º12'N, 13º35'W, by depth charges and gunfire from the British escort destroyers HMS Exmoor (Lt.Cdr. L.StG. Rich, RN) and HMS Blankney(Lt.Cdr. P.F. Powlett, DSC, RN), the British destroyer HMS Stanley (Lt.Cdr. D.B. Shaw, OBE, RN), the British corvette HMS Pentstemon (Lt.Cdr. J. Byron, RNR) and the British sloop HMS Stork (Cdr. F.J. Walker, RN), and by depth charges from a Martlet aircraft (Sqdn. 802) of the British escort carrier HMS Audacity (Cdr. D.W. Mackendrick, RN). (see map)

18 Aug, 1942
The British merchant ship Hatarana, that was torpedoed and damaged north-east of the Azores in position 41º07'N, 20º32'W by the German submarine U-214 was scuttled by gunfire from the British corvette HMS Pentstemon (Lt.Cdr. J. Byron, (retired), DSC, RNR), which also picked up 20 survivors and landed them at Londonderry.