Abarton,
Just outside Contalmaison and off the road leading from Mametz, past Bottom Wood and Quadrangle Wood is the village cemetery. At the far end of that cemetery is the 12th Manchesters Memorial, which commemorates those of the battalion who lost their lives during the Great War. The Memorial is somewhat remote and it was only by chance that I found it.
As regards the attack of the 7th July 1916, for various reasons it failed and the battalion's casualties for All Ranks numbered 555, amongst which was that of the CO Lt. Col. Harrison who was wounded. PhilipG.