The Robert Brown who died on 30 May 1918 mentioned before was at the time of his death in the 6th Battalion South Wales Borderers as ShaunJ has cited. The Register of Soldiers' Effects says he left his effects and gratuity to his mother
Elizabeth.
6 SWB were the Pioneer Battalion in 30 Division. He died at Luthernay Farm. This book puts Luthernay Farm in context.
https://archive.org/details/brigadierinfranc00cumm pages 160. 176 and 187 although this does not specifically describe his battalion's part in it, for that you need to look at their war diary on Ancestry. **
Sound more like your man?
maxD
** Or wait for Jim1's next expert post!