II Canadian Corps opened its first tactical headquarters in Normandy at Amblie on June 29, 1944. The headquarters became fully operational on July 7 as the 2nd Canadian Infantry Division began to arrive in France. This first division was soon joined by the 3rd Canadian Infantry Division and the 2nd Canadian Armoured Brigade, which had participated earlier in the Normandy landings and in Operation Windsor as part of I (British) Corps. The 4th Canadian (Armoured) Division was the third Canadian division-level component of the corps. Finally, for most of the campaign through Northwest Europe the corps also included Polish 1st Armoured Division.