Dad's Army

Sons of the Sea (3x14)

Air date: Dec 11, 1969

Captain Mainwaring comes up with the idea of small armed patrols to wreak havoc with the enemy, using a small repossessed boat the bank has acquired. After a practice on the river they get lost in the fog and they think they have drifted across the Channel and are about to be captured by the Germans, but they are in for a shock when they find out where they really are.