Again, 41 Squadron returned north to Catterick for a few weeks rest, but returned to Hornchurch on 3 September 1940, where they remained until the end of February 1941. They were now in the thick of the Battle of Britain. The price was high, but so was the damage they inflicted on the Luftwaffe. On 5 September, the squadron experienced one of its blackest days. The Commanding Officer and OC, B Flight, were killed in action and three other pilots were shot down and two were wounded in action; one of these was hospitalised for six months.