"The crew of a Boeing Fortress Mk I of No. 90 Squadron RAF putting on electrically-heated flying suits at Polebrook, Northamptonshire, before taking off for a high-altitude bombing attack on the German battlecruiser GNEISENAU at Brest, 24 July 1941." The crew of a Boeing Fortress Mark I of No. 90 Squadron RAF putting on electrically-heated flying suits at Polebrook, Northamptonshire, before taking off for a high-altitude bombing attack on the German battlecruiser GNEISENAU at Brest.