Cape Trafalgar
Following his third patrol (16 September 1941 – 1 November 1941) Suhren was awarded the Knight's Cross of the Iron Cross with Oak Leaves () on 31 December 1941. The patrol had left Brest and headed for the North Atlantic, North Channel, before Gibraltar, and Cape Trafalgar. "U-564" was resupplied with fuel at Cádiz, Spain before arriving in Lorient, France. On this patrol he was credited with sinking three ships of , including the on 24 October 1941.