forward as reinforcements but were back on the start line by Two German infantry companies worked southwards from the Switch Line for later in the evening but a renewal of the counter-attack was found to be impossible, due to the tremendous volume of British barrage fire and the presence of British reconnaissance and artillery-observation aircraft. July 20–21 July The 33rd Division attacked again at dusk on 19 July, when a battalion from the 100th Brigade pushed advanced posts towards the wood from Bazentin-le-Petit as a flank guard. Two battalions of the 19th Brigade crept forward on 20 July, during a bombardment and attacked when it lifted at The infantry got into the wood against machine-gun fire from the 8th Division troops of II Battalion, Infantry Regiment 165 and part of III Battalion, Infantry Regiment 72 in the Switch Line and a strong point in the western corner. Observers of 3 Squadron flew over the wood and despite mist, glimpsed enough to report that all but the north end of the wood had been captured and in the evening reported the loss of the north end to a counter-attack. A third battalion on the right flank arrived and helped to occupy the southern portion of the wood, thirty Germans being taken prisoner. During the afternoon of 21 July, another battalion went forward and managed to reach the northern fringe of the wood. Due to the number of British casualties, two more battalions were sent forward as reinforcements but as dark fell a German bombardment forced the British from the north end of the wood, which was re-occupied by German troops near (known to the British as the Switch Line) and both sides dug in. During the fighting for High Wood, the 5th Division and 7th Division attacked the Switch Line to the east. The 51st (Highland) Division relieved the 33rd Division after dark. 22/23 July Fog covered the area around High Wood until 22 July when vague reports of German digging in front of the Switch Line were confirmed. The crew of a 34 Squadron aircraft dived through the mist and saw a new German trench, several hundred yards in front of the Switch Trench, parallel to the British line from Bazentin-le-Peitit to High Wood. This new Intermediate Line was full of German troops and the III Corps headquarters immediately cancelled the 19th (Western) Division attack on the Switch Line, to