Hi Rachel
Your Grandad Tom would have been with the 1st Guards Brigade from Metz, comprising the1/ 2/3 Battalions Coldstream, 1st, Irish, 4th, Grenadiers, most loss's suffered since The Crimea, there was a story I am told of the Duty Major (Coldstream) calling roll after the battle and breaking down in tears as the loss's were made clear, this was a time when military men showed little emotion outwardly. The son of Runyard Kipling died with the 1st Irish Guards in the battle. It was the first time tanks in massed formation were used as covering for a major infantry attack, sadly with limited success.
regards
paul