| 1/1st Montgomeryshire Yeomanry 25th (Montgomery and Welsh Horse Yeomanry) Battalion, Royal Welsh Fusiliers | |
|---|---|
| Active | 10 August 1914 – 29 June 1919 |
| Country |  United Kingdom |
| Branch |  Territorial Force |
| Type | Yeomanry |
| Role | Cavalry/Infantry |
| Size | Regiment/Battalion |
| Part of | South Wales Mounted Brigade 74th (Yeomanry) Division |
| Garrison/HQ | Brook Street drill hall, Welshpool |
| Engagements | Second Battle of Gaza Third Battle of Gaza Capture of Beersheba Capture of the Sheria feature Capture of Jerusalem Defence of Jerusalem Battle of Tell 'Asur Hundred Days Offensive Second Battle of Bapaume Battle of Épehy Final advance in Artois and Flanders Liberation of Tournai |
| Commanders | |
| Notable commanders | Lt-Col Lord Kensington, CMG, DSO |
The 1/1st Montgomeryshire Yeomanry was an active service unit formed by the Montgomeryshire Yeomanry during World War I. It was sent to garrison Egypt and then amalgamated with another dismounted cavalry unit to form an infantry battalion, the 25th (Montgomery & Welsh Horse Yeomanry) Battalion of the Royal Welch Fusiliers. Serving in the 74th (Yeomanry) Division (the 'Broken Spur Division') it participated in the Sinai and Palestine campaign, including the capture of Beersheba and Jerusalem. Moving with the division to the Western Front it fought in the final campaign, including the desperate Battle of Épehy, until the Armistice. The regiment won two Victoria Crosses during its service. It was disbanded after the war.