Odd entry. No regiment, so nothing to go on, as a form 3 transfer from RIC, which he joined as a Barrack Defence Sgt. There are 16 "E Hall" commissioned in WO 338. He was posted to Z Coy, so must have had particular skills.
1893 Oct 23. Shropshire. The RIC entry is just for Edward Hall, born Shropshire. But the Halls born then in Shropshire have more names than just "Edward". In fact he was born Edward Alfred James Hall (correct dob in Shropshire) , son of Alfred Charles Hall & Annie Hall
1901 census at Shrewsbury, Shropshire
1911 census at 39 Hotspur St, Shrewsbury
Without clues on Regiment, I cannoy get his commisson, as the name is very common
1920 Jun 1. Joined RIC as a Barrack Defence Sgt
1921 Jan 1. Joined ADRIC with service no 1420. Posted to J Coy The Register entry says "no proposal" beside it
1921 Jun 8. Posted to Z Coy
1922 Jan 6. Posted to Depot Coy, but no actual record of discharge
He never seems to reappear