RHA in Photographs
- Images of the officers and NCOs of the 19th century Royal Horse Artillery.
- http://members.dca.net/fbl/indexrha.html

Horse Artillery of 1802
- A scholarly analysis of the deployment and utility of horse artiller in the 19th century.
- http://www.napoleon-series.org/military/organization/c_horsearty1.html

British Horse Artillery
- On the organisation and tactics of UK mobile artillery during the Napoleonic wars.
- http://www.napoleonguide.com/artillery_britain-royal-horse.htm

Wikipedia: Horse artillery
- Open encyclopedia article on the emergence of horse-drawn cannon regiments.
- http://en.wikipedia.org/wiki/Horse_artillery

The Transvaal Horse Artillery
- Unofficial home page for the South African regiment. Includes history, uniforms, and contact details.
- http://homepages.acenet.co.za/tha/

The Royal Canadian Horse Artillery
- Dispersed amongst three regiments, the RCHA perpetuates the traditions of the equestrian cannon of the 19th century.
- http://www.artillery.net/english/units1rcha.htm

The King's Troop Royal Horse Artillery
- Stationed in London, the regiment provides royal salutes and gun carriages for state funerals.
- http://www.army.mod.uk/kingstprha/ceremon.htm