The action on the day he was wounded took place to the west of Gouzeaucourt against the portion of the line that runs (see link) from the wiggle square in the bottom right quadrant of square 23 at the top of the map, down southwards to the bottom left quadrant of square 29 and then on to square 35. There are references in the diary to African Trench which can be seen (zoom in) in square 35.
Alfred George's service record is on Ancestry. He had served in UK from November 1916 until posting to France in June 1918 via 6th Royal West Kents to 1st RWK which is where he was serving when he died. However, his record shows he was wounded in the neck in the action and died later in 49 Casualty Clearing Station which was at Grevillers, about 16 miles to the west of Gouzeaucourt, hence his grave in the cemetery there. You know this OK, just seen your post
He had been awarded a Divisional parchment certificate for gallantry just a month before. This was just a step below a state gallantry award. More on this in a moment.
MaxD