Yeomanry is a designation used by a number of units and sub-units in the British Army Reserve which are descended from volunteer cavalry regiments that now serve in a variety of different roles.
In the 1790s, following the French Revolution and the rise of Napoleon Bonaparte, the perceived threat of invasion of the Kingdom of Great Britain was high.
In 1827, it was decided for financial reasons to reduce the number of yeomanry regiments, disbanding those that had not been required to assist the civil power over the previous decade.
These included requirements that individual yeomanry troopers attend a minimum number of drills per year in return for a "permanent duty" allowance, and that units be maintained at a specific strength.
Yeomanry officers and permanent drill instructors were required to undergo training at a newly established School of Instruction and the Secretary of State for War took over responsibility for the force, from individual Lords Lieutenant of counties.
Following the experience of the war, only the fourteen senior yeomanry regiments retained their horses, with the rest being re-designated as armoured car companies, artillery, engineers, or signals.
On the eve of the Second World War in 1939, the Territorial Army was doubled in size, with duplicate units formed; this led to some regiments being de-amalgamated.
In the current Army Reserve, several remnants of former Yeomanry regiments are still serving, usually as a sub-unit of a larger unit: In 1907 the First Aid Nursing Yeomanry was established as an all female volunteer organisation to provide a link between field hospitals and the front line, with their primary role being to rescue the wounded, rather than provide nursing care.