On 19 August, in the Action of the Cockcroft, parties from the 48th (South Midland) Division (XVIII Corps) and a composite company of the 1st Tank Brigade, attacked up the St Julien–Poelcappelle road to capture Hillock Farm, Triangle Farm, Maison du Hibou, the Cockcroft, Winnipeg Cemetery, Springfield and Vancouver, fortified farms, blockhouses and pillboxes. The advance was covered by a smoke barrage and low-flying aircraft which disguised the sound of the tanks. The infantry followed up when the tank crews signalled and occupied the strong points. Hillock Farm was captured at and fifteen minutes later Maison du Hibou was taken.