 The heaviest fighting was in the 5th Division's sector.Still on 27 May, Brooke ordered the 3rd Division commander, Major-General Bernard Montgomery, to extend his division's line to the left, thereby freeing the 10th and 11th Brigades, both of the 4th Division, to join the 5th Division at Messines Ridge.The 10th Brigade arrived first, to find the enemy had advanced so far they were closing on the British field artillery.