OK. I think this is it:
Battle of Flers–Courcelette, 15 September[edit]
Main article: Battle of Flers–Courcelette
Capture of High Wood[edit]
On 15 September, the 47th Division, which had relieved the 1st Division from 7–11 September, attacked the wood and the adjacent areas to the right and left with two brigades, between the New Zealand and 50th divisions.[39] Due to the narrowness of no man's land in and around the wood, the British troops were withdrawn during the preliminary bombardment but then sent forward again and the creeping bombardment was fired 150 yards (140 m) beyond the German front line. The artillery were given the wrong map coordinates, which led to the creeping barrage being fired another 100 yards (91 m) further on; four of the eight tanks allotted to the corps were substituted for a closer creeping bombardment at High Wood.[40] The tanks advanced at 6:20 a.m. and two reached the south of the wood but then turned east to find open ground. Tank D-22 lost direction, ditched in the British front line and then fired on British troops by mistake. The second tank drove into a shell hole but D-13 got into the wood and fired on Bavarian Infantry Regiment 18 in the German support line, until the tank was hit and set on fire. A German infantryman crept up on the tank and shot one of the crew in the leg through a loop-hole; the fourth tank broke down in no man's land. The fate of the three tanks was reported at 10:00 a.m. by the crew of a 34 Squadron contact patrol, who then flew back to the wood and saw that the attacks by the New Zealanders and the 50th Division had enveloped the wood and the defenders of the Switch Trench nearby. On their return, the crew convinced the III Corps headquarters to cancel an attack from the wood.[41] The infantry advance into the wood had been stopped by machine-gun fire and in the mêlée, part of the three battalions advancing ready to attack the second objective, went into the wood and joined in.[42]
At 11:40 a.m., the 140th Trench Mortar Battery fired a hurricane bombardment of 750 mortar bombs into the wood in fifteen minutes. The 34 Squadron crew made a second sortie and at 12:30 p.m., watched as parties of Germans began to surrender to bombers working forward along the edges of the wood.[41] Several hundred soldiers of Bavarian Infantry Regiment 23 of the 3rd Bavarian Division were taken prisoner, along with six machine-guns and two heavy howitzers and the survivors of the 141st Brigade captured the wood by 1:00 p.m. As night fell, the division had no organised front line, except on the extreme right and only the first objective had been captured, although this gave the British observation of the German defences north-eastwards to Bapaume.[43][44] The survivors of Bavarian Infantry Regiment 23 managed to rally beyond Martinpuich and reinforcements from the 50th Reserve Division arrived and then counter-attacked with the remnants of the Bavarians at 5:30 p.m. The Germans managed to advance to within several hundred yards/metres of High Wood and Martinpuich and then dug in.[45] Engineers of the 50th Division on the left of the 47th Division worked through 16–17 September, using bricks from Bazentin-le-Petit to fill shell holes in the road leading to High Wood and dug Boast Trench to link the flanks of both divisions, which had been separated for three days. Tramlines were build west of the wood towards Eaucourt l'Abbaye and later extended to Bazentin-le-Petit, so that the wood could be avoided.
I think his position with the 50th. was at switch trench (map 1)
Map 2 shows the wood had been taken & the Divisional boundary (50th.) (yellow line) is now north of high wood.
The 1st. objective had now been achieved.
