Evidence for the use of the amphitheatre at Richborough as a defensive position during WWII has been seen on 1940s aerial photographs of the site. The defensive features include a probable machine gun emplacement dug into the southern side of the amphitheatre and several lines of barbed wire entanglements. A length of slit-trenching, lying between two entanglements to south of the amphitheatre, had already been recorded within the HER as TR 35 NW 113 and is presumably part of the same defensive scheme. The barbed wire entanglements were removed following the war and are not visible on late 1940s aerial photographs. The gun emplacement appears to have also been infilled by this date; it appears to have been totally levelled as no surface trace of the feature is visible on recent aerial photography.