On 11 September, during the height of the Battle of Britain, Tuck was promoted to acting squadron leader and posted to command the Hawker Hurricane-equipped No. 257 Squadron RAF, based at RAF Coltishall (his substantive rank had been raised to flight lieutenant on 3 September). He led his squadron into combat through September and continued to claim further victories. His last two official victories of the Battle were on 28 October, where he claimed two "probable" Bf 109s. He received a Bar to his DFC on 25 October. The official citation for his second DFC, published in the "London Gazette" reads: