 Six Canadian destroyers and 17 corvettes, reinforced by seven destroyers, three sloops, and five corvettes of the Royal Navy, were assembled for duty in the force, which escorted the convoys from Canadian ports to Newfoundland and then on to a meeting point south of Iceland, where the British escort groups took over.By 1941, the United States was taking an increasing part in the war, despite its nominal neutrality.In April 1941 President Roosevelt extended the Pan-American Security Zone east almost as far as Iceland.