Two days later, on 13 July, Hudson was shot down between Bruges and Ostend by aircraft from "Jasta 20". Initially reported as missing, it was not until September his father, Frank Hudson, of Park Langley, Beckenham, received notification that his son was unwounded and a prisoner of war at Karlsruhe. Hudson remained a POW until after the armistice in November 1918, and in December 1919 received a mention in despatches "for valuable services whilst in captivity".