A Yeomanry (Irregular Cavalry) Regiment raised during the Boer War (1899 to  1901) from Scotsmen living in South Africa and commanded by the Marquis of Tullibardine who later became the Duke of Atholl. A second regiment was raised in 1901 from volunteers from Scotland and Australia.

In the First World War the 1^st, 2^nd and 3rd Regiments of Scottish Horse were brigaded together and fought in a dismounted role in Gallipoli and Egypt. Later some men formed the Scottish Horse Battalion, 13^th Battalion Black Watch, and fought in Salonika and on the Western Front while others were formed into the 26^th Squadron, the Machine Gun Corps and served in Egypt.

The Scottish Horse remained as cavalry scouts until December 1939 when they were converted to artillery and formed 79th and 80^th Medium Regiments, Royal Artillery. They fought in Sicily, Italy and North West Europe.

In  1956 the regiment amalgamated with the Fife and Forfar Yeomanry and in turn became a part of the Highland Yeomanry, the Scottish Yeomanry and the Queen’s Own Yeomanry.

The Marchioness of Tullibardine, A Military  History of Perthshire, Perth, 1908