On 29 September, the two American divisions attacked followed by the two Australian divisions, with approximately 150 tanks of the 4th and 5th Tank Brigades of the British Tank Corps (including the newly trained American 301st Heavy Tank Battalion, which was equipped with British tanks) in support of the four divisions. The objective of the Americans was the Le Catelet-Nauroy Line, a defensive line east of the canal. Here the Australian 3rd Division (behind the U.S. 27th) and 5th Division (behind the U.S. 30th) were intended to "leapfrog" through the American forces and press on towards the Beaurevoir Line. Australian 2nd Division was in reserve.