Throughout 1942, the Swordfish was progressively transferred from the Royal Navy's fleet carriers as newer strike aircraft, such as the Fairey Albacore and Fairey Barracuda, were introduced. In the submarine-hunter role, the Swordfish made critical contributions to both the Battle of the Atlantic, detecting and attacking the roaming U-boat packs that preyed upon merchant shipping between Britain and North America, and in support of the Arctic convoys which delivered supplies from Britain to Russia. In addition to attacking located submarines, Swordfish would guide destroyers onto their positions to coordinate attacks against them. On one such convoy, Swordfish on board the escort carrier HMS "Striker" and HMS "Vindex" flew over 1,000 flight hours conducting anti-submarine patrols over a 10-day period.