On June 7, 1944, D+1, the 12th SS Hitler Youth Division blocked the Canadian and British advance to Carpiquet and Caen by committing the tanks and infantry of Kurt Meyer’s 25th Panzer Grenadier Regiment to battle. It was a tactical victory with enormous operational consequences. Sepp Dietrich, the commander of 1st SS Panzer Corps, who was supposed to launch a powerful counterattack against the Allied bridgehead in Normandy with three armoured divisions, found that both 21st Panzer and 12th SS were heavily engaged and could not be withdrawn. Panzer Lehr, the third armoured division, was also being drawn into combat with British 30 Corps.