 Complete the following phrase:  The RAAF and RAN took part in the Battle of the Atlantic. No. 10 Squadron, based in Britain at the outbreak of war to take delivery of its Short Sunderland flying boats, remained there throughout the conflict as part of RAF Coastal Command. It was joined by No. 461 Squadron in April 1942, also equipped with Sunderlands. These squadrons escorted Allied convoys and sank 12 U-boats. No. 455 Squadron also formed part of Coastal Command from April 1942, as an anti-shipping squadron equipped with light bombers. In this role the squadron made an unusual deployment to Vaenga air base in the Soviet Union in September 1942, to protect 