In September, the Australians took part in the Third Battle of Ypres. Within this wider battle, the Australian divisions took part in several subsidiary actions. The 1st and 2nd Divisions undertook the first attack around the Menin Road, which was followed up by the 4th and 5th Divisions around Polygon Wood on 26 September. Attacking in the centre of the Allied line, the two divisions were flanked by the British V Corps to the north, and X Corps to the south. The 4th Division was the more northern of the two Australian divisions for the assault, and tasked with capturing the northern part of Polygon Wood, and the high ground beyond it, and tying-in with the British around the edge of Zonnebeke while the 5th Division captured the remainder of the wood. Supported by a well co-ordinated artillery barrage, which rolled ahead of the assault, and then broke up the subsequent German counter-attack, the attack proved successful, albeit costly. The 4th Division's attack was carried by the 4th and 13th Brigades, with the 12th in reserve, and resulted in 1,700 casualties amongst the division.