 In the south, the advance was to link with the I Anzac Corps along the Ypres–Roulers railway line south of Vienna Cottage.The southern flank of the main assault would once again be the responsibility of the 4th Canadian Division, which planned to attack with the 12th Canadian Infantry Brigade.The northern flank remained the responsibility of the 3rd Canadian Division, which would advance with the 7th and 8th Canadian Infantry Brigades.