Montgomeryshire Yeomanry

The Montgomeryshire Yeomanry unlike the other Yeomanry regiments was only formed in 1813 when the threat of a French invasion was almost over. They served as part of the Imperial Yeomanry during the Boer War and formed three regiments for service during World War I.

Boer War
The Montgomeryshire Yeomanry provided troops for the 9th Battalion imperial Yeomanry and formed the following companies:
 * 31st (Montgomeryshire) Company, raised 1900.
 * 49th (Montgomeryshire) Company, raised 1900.
 * 88th (Welsh Yeomanry) Company, raised 1901,sponsored by the Montgomeryshire Yeomanry Cavalry
 * 89th (Montgomeryshire) Company, raised 1901.

World War I
The Mongomeryshire Yeomanry formed three regiments for service during World War I, the original Territorial Force Regiment was now joined by second and third line regiments.

1/1st Montgomeryshire Yeomanry
The 1/1st Montgomeryshire Yeomanry was mobilised in August 1914 as part of the South Wales Mounted Brigade they were attached to the 1st Mounted Division. In November 1915 they were dismounted and moved to Egypt, where they were drafted into the 4th Dismounted Brigade in 1916. In March 1917 they were re-roled as infantry and together with the Welsh Horse were converted into the 25th (Montgomery and Welsh Horse Yeomanry) Battalion, Royal Welsh Fusiliers, they joined the 231st Brigade,of the 74th (Yeomanry) Division. In May 1918, the Division moved to France, and the battalion saw action on the Western Front.

2/1st Montgomeryshire Yeomanry
The 2/1st Montgomeryshie Yeomanry was formed in September 1914, and attached to the 2/1st South Wales Mounted Brigade. They were converted to a cyclist unit in October 1916. They remained in the United Kingdom and were disbanded at the end of the war.

3/1st Montgomeryshire Yeomanry
The 3/1st Montgomeyshire Yeomanry was formed in 1915. They also remained in the United Kingdom until they were disbanded in early in 1917.

Notable commanders

 * 1905–1917: Colonel R. W. H. W. Williams-Wynn