22 Aug, 1941
At 2331 hours the German submarine U-564 fired a salvo of four torpedoes at the convoy OG-71 west of Aveiro, Portugal and observed four different detonations and three columns of fire, later lifeboats were seen. Suhren thought that he had sunk two ships and damaged two others. However, only two ships were hit and sunk, the British merchant ship Empire Oak and Irish merchant ship Clonlara in position 40º43'N, 11º39'W. The master Joseph Reynolds and 12 crew members from the Clonlara were picked up by the British corvette HMS Campion (Lt.Cdr. A. Johnson, RNVR) and landed at Gibraltar on 24 August. Six crew members were lost. The master Frederick Edward Christian, three crew members and four gunners from the Empire Oak were picked up by the British corvette HMS Campanula (Lt.Cdr. R.V.E. Case, DSC, RNR), later transferred to the British destroyer HMS Velox (Lt.Cdr. E.G. Roper, DSC, RN) and landed at Gibraltar on 25 August. 13 crew members were lost. On 19 August, the Empire Oak had picked up six survivors from Aguila and eleven survivors from Alva. The survivors from Aguila died when this ship was sunk, while the other survivors were also rescued by the corvette.