On 14 March 1945, Ascension led a Royal Navy hunter-killer group to the scene of an attack by the South African Navy frigate HMSAS Natal on the German submarine U-714 off St. Abbs, Scotland, which had brought oil and a metal tank to the surface at 55°57′00″N001°57′00″W / 55.95000°N 1.95000°W / 55.95000; -1.95000 ("U-714 sunk"). While Natal proceeded to Scapa Flow in the Orkney Islands, Ascension's group depth-charged the position, bringing more flotsam from the submarine to the surface. The destroyerHMS Wivern claimed a share of the kill after depth-charging an oil slick 10 nautical miles (19 km; 12 mi) to the south under the assumption that it was oil from U-714, which Wivern's crew believed had been only been damaged by Natal and was attempting to escape. Although some controversy surrounds credit for the sinking, naval authorities later determined that Natal had sunk U-714 with the loss of the submarine's entire crew of 50 men and gave Natal sole credit for the sinking.[1][2][3][4]