Updated with photo of Captain Grundy
Historians from Oxford Preparatory School have recently published a letter from Captain Leslie Grundy of the Machine Gun Corps during the assault and defence on the First Day of the Somme. He confirmed the position of a row of artillery guns in front of Oxford Copse on the evening before the Big Push. Source: July 27th 1916 | The Skipper’s War
More importantly we learn that the detachment of 17th Battalion Manchester Regiment retired from Triangle Point at 7am – holding out for three and a half hours. It also seems the lives of these men was saved by the 90th Machine Gun Company, who covered their withdrawal to a shell hole from the German Infantry counter-attack.
The draft post became too extensive and a little off topic, so here’s a more detailed account in the Battlefield Sleuth Series. Machine Gun Corps at Montauban