Sharpe's Havoc - Bernard Cornwell

1809, Portugal: Richard Sharpe and his riflemen are separated from the British Army, and under orders to locate and protect Miss Kate Savage, only daughter of one of the wealthy English Oporto wine merchants. A ripping yarn, featuring battles against overwhelming odds, where base born soldiering skills outwit French mortars and Dragoons, and horrific violence of victor over vanquished. The action culminates in the battle to liberate Oporto, and a route march through the mountains, as British and Portuguese armies and partizans try to cut off the fleeing French Army's only escape.

Amazon.co.uk: Sharpe's Havoc - Bernard Cornwell

Sharpe Novels: an Amazon Listmania list, giving the Sharpe series in order of event rather than publication.