http://www.dutchsubmarines.com/boats/bo ... 6:02%20hrs14 Mar - Dec 1941: O 21 is attached to the 8th Flotilla in Gibraltar and is under British operational control.
3 Apr - 12 Apr 1941: O 21 escorts convoy HG 58 (Gibraltar - U.K.) until 45°N.
13 Apr 21 Apr 1941: O 21 escorts convoy OG 58 (U.K. - Gibraltar), she engages the convoy at 45°N.
6 May - 13 May 1941: O 21 escorts convoy HG 61 (Gibraltar - U.K.) until 45°N.
13 May - 18 May 1941: O 21 escorts convoy OG 61 (U.K. - Gibraltar), she engages the convoy at 45°N.
6 May - 18 May 1941: O 21 patrols the Bay of Biscay and the Atlantic Ocean. No attacks are made.
4 June - 11 June 1941: O 23 escorts convoy HG 64 (Gibraltar - U.K.), she engages the convoy at 45°N.
12 June - 18 June 1941: O 23 escorts convoy OG 64 (U.K. - Gibraltar), she engages the convoy at 45°N.
Was this practice widespread amongst Allied submarines in WW2 or just perculiar to the Gib convoys and Dutch Submarines?
Andy H