 A Royal Warrant was issued on 24 December 1899 to allow volunteer forces to serve in the Second Boer War.The Royal Warrant asked standing Yeomanry regiments to provide service companies of approximately 115 men each for the Imperial Yeomanry.With the Ayrshire Yeomanry, the regiment co-sponsored the 17th (Ayrshire and Lanarkshire) Company for the 6th (Scottish) Battalion in 1900; in 1901 it provided the 107th (Lanarkshire) Company.