At the time of the Napoleonic Wars, the British Army's cavalry consisted of heavy and light regiments:

The heavy cavalry consisted of 12 regiments: the 1st to 7th Dragoon Guards and the 1st to 6th Dragoons (5th Dragoons had mutined in 1799 and been disbanded).

The light cavalry consisted of 25 regiments: 7th to 29th Light Dragoons + 2 regiments of the King's German Legion (KGL). Some of the Light Dragoon regiments changed their name to Hussars - 10th (1806) and 5th, 15th and 18th (by 1807). 

Author: Susan Carroll

Title: Rendezvous

'Lieutenant Charles Carr of the Ninth Cavalry'

The Ninth Cavalry is an American cavalry regiment formally consituted in 1866!

During the Napoleonic Wars there were 105 foot (infantry) regiments - all numbered.

Consisted in the Regency period (and still consists) of Cavalry and Infantry units:

Household Cavalry:

1st and 2nd Regiments of Life Guards - senior regiment in the British army

The Royal Horse Guards Blue

The (First) Royal Regiment of Dragoons.

NB! The latter two were amalgamated in 1969 and became known as The Blues and Royals.

Foot Guards: (by order of seniority - precedence)

1st Regiment of Footguards - formed in 1656 (only at the end of the Napoleonic Wars did a name change allow the unit to adopt the title 'Grenadier Guards').

Coldstream Guards - formed 1650, although years older than the 1st Regiment of Footguards the Coldstream were intially formed as part of Cromwell's New Model Army.

Scots Guards - formed in 1642 but joined British Army in 1686.

Irish Guards - formed in 1900

Welsh Guards - formed in 1915