The squadron was still equipped with the Vildebeest when the Second World War broke out in September 1939, with the squadron carrying out anti-submarine patrols over the English Channel. From November 1939 the squadron started to receive Bristol Beaufort twin-engined monoplanes to replace its obsolete biplanes. The Bristol Taurus engines of the Beaufort proved unreliable at first, and the squadron continuing to fly operations with the Vildebeest while converting to the Beaufort. It flew its last operational mission with the Vildebeest on 20 December 1939.