Light Dragoons by Allan Mallinson

This is not a further Matthew Hervey novel but a history of the British Light Dragoons Regiment (really more about it's antecedents, as it was formed in 1992).

It's an entertaining read, following the various postings and actions of the units concerned from the earliest forerunners in the 17th century. Anecdotes, regimental legends and the letters and journals of soldiers are scattered through as well.