Two regiments of the German 50th Reserve Division attacked on a front, either side of the Reutelbeek, supported by aircraft and and batteries of artillery, four times the usual amount for a division. The German infantry managed to advance on the flanks, about near the Menin road and north of the Reutelbeek. The infantry were supported by artillery-observation and ground-attack aircraft; a box-barrage was fired behind the British front-line, which isolated the British infantry from reinforcements and ammunition. Return-fire from the 33rd Division and the 15th Australian Brigade of the 5th Australian Division along the southern edge of Polygon Wood to the north, forced the attackers under cover around some of the pillboxes, near Black Watch Corner, at the south-western edge of Polygon Wood. German attempts to reinforce the attacking troops failed, due to British artillery observers isolating the advanced German troops with artillery barrages.