Yeomanry are part of the reserve for the British Army. At the start of First World War there were fifty-four yeomanry regiments in the British Army. Soon after the declaration of war, it was decided to increase the number of these volunteer mounted regiments. The new regiments were mirror formations of the existing first line regiments, with the same name and served initially in the same brigades. However they were all classed as second line units. The first line regiments, were numbered the 1/1st while the second line became the 2/1st or in cases where there were more regiments with the same name, or already numbered, the 2/2nd or 2/3rd.

The North Somerset Yeomanry was a part-time cavalry regiment of the British Army from 1798 to 1967. It maintained order in Somerset in the days before organised police forces, and supplied volunteers to fight in the Second Boer War. It served on the Western Front in the First World War. At the outbreak of the Second World War, it continued to operate in the mounted role and then as a specialist signals unit. Postwar it joined the Royal Armoured Corps and later became infantry. Its lineage today is maintained by 93 Squadron 39 (Skinners) Signal Regiment.