 Complete the following phrase:  In January 1941 Bluebell was attached to the 5th Escort Group, Western Approaches Command, based at Liverpool, to escort Atlantic convoys, transferring in September to the 37th Escort Group for the defence of convoys between Gibraltar and ports in West Africa. She returned to the UK in July 1942 to refit, and was assigned for service on the Russian Convoys. In September she sailed to Iceland to join the escort of 