During a patrol of Pentland Firth, U-21 ran aground on 26 March 1940 off the island of Oddknuppen, SE of Mandal. As a result of this diplomatic incident, U-21 and her crew were interned by the Norwegians at Kristiansand-Sud until after the German landings in Norway on 9 April 1940.
Charles McCain is a Washington DC based freelance journalist and novelist. He is the author of "An Honorable German," a World War Two naval epic. You can read more of his work on his website: http://charlesmccain.com/ View all posts by Charles McCain