Formed at Devizes in September 1914, the 6th (Service) Battalion was soon assigned to the 19th (Western) Division, eventually being assigned to the 58th Brigade. In July 1915, the battalion was sent to France with the rest of the division. It would see action at the Battle of the Loos, Battle of the Somme, and Third Ypres. Due to losses sustained in Passchendaele campaign in 1917, the 6th Battalion would be amalgamated with the Wiltshire Yeomanry to form the 6th (Royal Wiltshire Yeomanry) battalion on 9 September 1917. Eventually, the battalion would be reduced to cadre strength. The excess personnel would be used as replacements for the 2nd Battalion which assumed its place in the 58th Brigade. The cadre was returned to England on 18 June 1918 and the battalion brought up to strength by absorbing the 9th Battalion, Dorset Regiment.