SC 7 was the code name for a large Allied World War II convoy of 35 merchant ships and six escorts, which sailed eastbound from Sydney, Nova Scotia, for Liverpool and other United Kingdom ports on 5 October 1940. While crossing the Atlantic, the convoy was intercepted by one of the first Kriegsmarine submarine wolfpacks. During the ensuing battle, the escort was completely overwhelmed and 20 of the 35 cargo vessels were sunk and 2 more damaged, with 141 lives lost. The disastrous outcome of the convoy demonstrated the German submarines' potential of being able to work more efficiently using wolfpack tactics and the inadequacy of British anti-submarine tactics at the time. Ships of the convoy The slow convoy SC 7 left Sydney, Nova Scotia on 5 October 1940 bound for Liverpool and other British ports. The convoy was supposed to make but several merchant ships were much slower, necessitating a further reduced speed. The convoy consisted of older, smaller ships, mostly with essential cargoes of bulk goods. Much of the freight on these ships originated on Canada's east coast, especially from points to the north and east of Sydney. Typical cargoes included pit props from eastern New Brunswick for British coal mines, lumber, pulpwood, grain from the Great Lakes ports, steel and steel ingots from the Sydney plant and iron ore from Newfoundland, bound for the huge steel plants of Wales. The largest ship in the convoy was the 9,512-ton oil tanker , belonging to the Admiralty, which was bound for the Clyde with fuel for the Royal Navy. Another ship, the British , carried a valuable cargo of trucks. Many of the ships were British but the convoy included Greek, Swedish, Norwegian and Dutch vessels. The convoy commodore, Vice Admiral Lachlan Donald Ian Mackinnon, a retired naval officer who volunteered for this civilian duty, sailed in , a British ship of . As convoy commodore, Mackinnon was in charge of the good order of the merchant ships but did not command the escort. The sloop was sole naval escort for the first three quarters of the journey. There was no aircraft protection in 1940 for Allied ships in the Atlantic Ocean after leaving coastal regions. Scarborough would have had little chance against a surface attack by a German raider. Many of the merchant ship captains were resentful at having to sail in convoy and would have preferred to