In 1834, the troops were regimented as the Derbyshire Yeomanry Cavalry, who sponsored two companies of the Imperial Yeomanry in 1900, for service in the South African War, and in 1901 was itself reorganized as mounted infantry as the Derbyshire Imperial Yeomanry.
The Imperial Yeomanry’s first action was on 5 April 1900, when members of 3rd and 10th battalions fought Boer volunteers led by Frenchman Count de Villebois-Mareuil at Boshof.
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The regiment was raised in 1901 at the express wish of the new King Edward VII, and titled the Norfolk (King′s Own) Imperial Yeomanry with the Royal cypher as their badge.