Having volunteered for his second tour, Brill underwent conversion to Handley Page Halifax and Avro Lancaster heavy bombers in the last months of 1943. In the new year, he was appointed a flight commander in No. 463 Squadron RAAF, operating Lancasters out of RAF Waddington, Lincolnshire. Waddington was also home to another Australian squadron, No. 467, and Brill took an active part in the station's raucous mess life. His younger brother Vic, who had joined the RAAF in 1941, was in the same squadron. Brill returned to combat in the middle of the Battle of Berlin, flying his first sortie to the "Big City" on 20 January 1944. The statistical likelihood of surviving an operational tour of 30 missions in Bomber Command was never more than 50%, but loss rates during the Battle of Berlin were far higher.