Cruiser tank

Forced landing at sea outside Byneset in Trondheim. The Aircraft was salvaged by the Germans. Eight of the Fifteen Skuas from 800 and 803 Squadron,were shot down during their attack on the German battle cruisers Scharnhorst and Gneisenau in Trondheim harbour. Leutenant Cecil Howard Filmer, and Midshipman Thomas Anthony McKee became POWs. L2963 was shot down by Oblt. Gordon Gollob of I./ZG 76

803.Squadron Fleet Air Arm "Ark Royal" 7F:L2963

British soldiers observing the naval 2 victories of this 88... perhaps was it used in the Tobruk defence during the attempted British landing?
Kindly could anyone translate the German wrote on the cannon? DVX