aground at Oddene near Ryvingen south-east of Mandal. Marinens Flyvebaatfabrikk M.F.11 F.328 landed near the U-boat and guarded it until Norwegian naval vessels reached the scene and interned the crew. U-21 was towed to Kristiansand the next day under escort of Kjell, Teist, the destroyer and the B-class submarine . German invasion On 8 April 1940, the day before the German invasion, Kjell was in Kristiansand carrying out repairs which were finished by afternoon. The next morning she was ordered to nearby Marvika naval base to take on board torpedoes. However, before the vessel could be made war ready orders came through from the commander of the local naval section that resistance to the German invasion in the Kristiansand area was to cease. As the Germans occupied Marvika Kjell was allowed to move to nearby Vigebukta bay in the Topdalsfjord. On 11 April the torpedo boat was seized by German infantry and at 1830hrs the German war flag was raised, signalling the ship's transfer to Kriegsmarine service. German service Initially renamed KT1 and used as a Vorpostenboot (outpost boat), she was then rebuilt as a minesweeper under the name NK.02 Dragoner. Serving as a patrol boat and escort vessel on the coast of occupied Norway, Dragoner was sailing alone off Ryvingen near Mandal when she was discovered and attacked by six No. 248 Squadron RAF de Havilland Mosquito fighter bombers on 28 September 1944. After a brief and futile fight she was sunk by a combination of autocannon fire and a depth charge exploding underneath her midship section. Of the 25 Germans on board at the time of the sinking 18 survived, seven of whom were wounded. The attacking RAF aircraft suffered no damage from the German return-fire and all returned to base. Discovery of the wreck The wreck of Dragoner was discovered partly intact at some depth several kilometres from land by a team of three Norwegian divers in February 2006. The wreck has since been declared a war grave. Footnotes Literature Naval ships of Norway captured by Germany during World War II Patrol boats Ships built in Horten Torpedo boats of the Royal Norwegian Navy World War II minesweepers of Germany World War II torpedo boats of Norway World War II shipwrecks in the North Sea 1912 ships Maritime incidents in September 1944 Ships sunk by British aircraft