« Reply #14 on: Friday 22 April 16 18:05 BST (UK) »
R.H.A. = Royal Horse Artillery.
Searching for "William Smith, Royal Horse Artillery" on the national archive "Discovery" website 69 results were shown. Only one of those men was a Bombardier:
Reference: WO 372/18/177163
Description: Medal card of Smith, William
Corps: Royal Horse Artillery
Regiment No 487
Royal Horse Artillery Driver 608093
Rank: Acting Bombardier
Date: 1914-1920
Held by: The National Archives, Kew
Aberdeen: Findlay-Shirras,McCarthy: MidLothian: Mason,Telford,Darling,Cruikshanks,Bennett,Sime, Bell: Lanarks:Crum, Brown, MacKenzie,Cameron, Glen, Millar; Ross: Urray:Mackenzie: Moray: Findlay; Marshall/Marischell: Perthshire: Brown Ferguson: Wales: McCarthy, Thomas: England: Almond, Askin, Dodson, Well(es). Harrison, Maw, McCarthy, Munford, Pye, Shearing, Smith, Smythe, Speight, Strike, Wallis/Wallace, Ward, Wells;Germany: Flamme,Ehlers, Bielstein, Germer, Mohlm, Reupke