Claim: Fortress of Mimoyecques, the modern name for a Second World War underground military complex, was first attacked on November 5, 1943 and was once again attacked on November 8, 1943 by the No. 2 Group of the RAF Second Tactical Air Force.
Evidence: The Fortress of Mimoyecques (French pronunciation: ​[mimɔjɛk) is the modern name for a Second World War underground military complex built by the forces of Nazi Germany between 1943 and 1944. 5 November 1943 Attacks on Mimoyecques site 8 November 1943 No. 2 Group of the RAF Second Tactical Air Force attacked Mimoyecques with three waves each of 24 Douglas Boston medium bombers. The first two waves (24 aircraft of Nos. 88 and 342 Squadrons and 24 of Nos. 98 and 180 Squadrons) reported bursts on the railway, in the target area, and on the tunnel entrance. The third wave (19 aircraft of Nos. 226 and 305 Squadrons) reported bomb bursts near the north aiming point. Six North American Mitchells of No. 320 Squadron also attacked. In the course of the raid one Mitchell was shot down and 12 bombers were damaged by flak.