Raised after the declaration of war, it was a mirror formation of the first line Scottish Horse Mounted Brigade.

He was commissioned in the Lanarkshire Yeomanry (later the Scottish Horse).

When World War I started in 1914, he joined the Scottish Horse.

However the horses were withdrawn at Dunkeld and after a brief wait the Scottish Horse were formally dismounted.

The Scottish Horse, in common with the other Yeomanry regiments, wore standard khaki for most other occasions after 1914.

In addition both of the guidons of the Scottish Horse are also lain up in the Cathedral.

His inter-war career was active, he served as adjutant to the Scottish Horse from 1920-24 and was promoted to major during this posting.

This success continued until the Scottish Horse was a whole brigade by the end of the Second Boer War.

He served in World War II with The Scottish Horse.

Scottish Horse, Yeomanry, and Derbys pushed on, the young soldiers of the two former corps keeping pace with the veteran regiment.