 I Anzac Corps was committed six weeks after the start of the battle and on 16 September , having marched through Ypres the night before , the 1st and 2nd Divisions took up a position in the trenches on the main ridge at Glencorse Wood . The first attack came on 20 September at Menin Road , where the Australians experienced success making considerable gains against the enemy for the loss of about 5 @,@ 000 casualties . On 26 September , the 4th and 5th Divisions attacked and captured Polygon Wood , while later on 4 October , another successful attack was made on the main ridge at Broodseinde , where the four Australian divisions involved fought side by side , as they clashed head on with a German counterattack that had been launched at the same time the Australians had risen to carry out their assault . The result was a rout by the Australians , as the German line broke and following further attacks against German pillboxes , the ridge was captured . 
