 By April 1943, the regiment was back under 3 Indian AA Bde at Bombay while 216 HAA Bty was with 1 Indian AA Bde in the Calcutta area.Calcutta was raided regularly during the winter of 1942–43, as was the supply base at Chittagong when British forces advanced int the Arakan in December 1942.This offensive was a failure, but British forces continued to build up for the eventual reconquest of Burma.