The second phase would follow immediately. While the remaining four infantry brigades of the 2nd Canadian Division and 51st (Highland) Division cleared up the isolated German forward defences and the 3rd Canadian Division and 49th (West Riding) Division (I Corps) began subsidiary attacks to widen the base of salient captured in the first phase, the 4th Canadian Armoured Division and 1st Polish Armoured Division would move up the corridor to Cramesnil and prepare to advance further south. To prepare for their attack, bombers of the US Eighth Air Force would bombard the German reserve positions at Hautmesnil. The ultimate objective was the high ground north of Falaise, beyond the start line.