The displays continued throughout the First World War, except that the use of rockets was prohibited under the Defence of the Realm Act. Reflecting contemporary events, the theme for the 1915 display was "The Battle of the Marne"; in 1916 it was "The War in Flanders", during which one spectator got so caught up in the action that he waded across the lake to join in with the "fighting". Anticipating the outbreak of the Second World War, the theme for the 1933 display was "Air Raid on London".