On 1942-07-13, Pilot F A Duff (Flight Sergeant, RCAF) service number R/78406 flew a Spitfire Vb serial BL782 for this duty: Circus. His mission was not completed. Circumstances of the aircraft loss: Collided with another aircraft, more precisely, Spitfire Vb serial BM650 flow by squadron mate F/O Tyre. Both aircraft were part of squadron no. 401. The location for the map is the Somme estuary. Circumstances at the end of this mission for Duff: he was killed. He is commemorated at: Villeneuve-St. Georges Old Communal Cemetery, France.