Result from Military forum.
Thomas Hatfield
17934 left his effects to a Miss Lillian E Slack (or Stack) his sole legatee - does that help (Soldiers Effects). He enlisted in April/May 1915. 5th Battalion was a Shrewsbury raised battalion but that does not necessarily mean he was from there.
MaxD
Age - he was over 40 but he volunteered so I don't think age is relevant
My reply - Lillian Ellen Slack is at the address he was visiting in Rhyl in 1901, she is still there in 1911,
That seems to be a pretty good clue. I have searched newspapers for a report on his death, but not found anything..