oh my giddy aunt how you can you discuss Bernard Cornwall and not discuss his greatest series Richard Sharpe?
There are 24 books in the Sharpe Series:
01 Sharpe's Tiger
Richard Sharpe and the Siege of Seringapatam, 1799 (1997)
02 Sharpe's Triumph
Richard Sharpe and the Battle of Assaye, September 1803 (1998)
03 Sharpe's Fortress
Richard Sharpe and the Siege of Gawilghur, December 1803 (1999)
04 Sharpe's Trafalgar Richard Sharpe and the Battle of Trafalgar, October 1805 (2000)
05 Sharpe's Prey
Richard Sharpe and the Siege of Copenhagen, 1807 (2001)
06 Sharpe's Rifles
Richard Sharpe and the French Invasion of Galicia, January 1809 (1988)
07 Sharpe's Havoc
Richard Sharpe and the Campaign in Northern Portugal, Spring 1809 (2003)
08 Sharpe's Eagle
Richard Sharpe and the Talavera Campaign, July 1809 (1981)
09 Sharpe's Gold
Richard Sharpe and the Destruction of Almeida, August 1810 (1981)
10 Sharpe's Escape
Richard Sharpe and the Battle of Bussaco, September 1810 (2004)
11 Sharpe's Fury
Richard Sharpe and the Battle of Barrosa (March 1811), Winter 1811 (2007)
12 Sharpe's Battle
Richard Sharpe and the Battle of Fuentes de Oñoro, May 1811 (1995)
13 Sharpe's Company
Richard Sharpe and the Siege of Badajoz, January to April 1812 (1982)
14 Sharpe's Sword
Richard Sharpe and the Salamanca Campaign, June and July 1812 (1983)
15 Sharpe's Skirmish
Richard Sharpe and the Defence of the Tormes, August 1812 (short story) (1999) (revised extended edition published 2002)
16 Sharpe's Enemy
Richard Sharpe and the Defence of Portugal, Christmas 1812 (1984)
17 Sharpe's Honour
Richard Sharpe and the Vitoria Campaign, February to June 1813 (1985)
18 Sharpe's Regiment
Richard Sharpe and the Invasion of France, June to November 1813 (1986)
19 Sharpe's Christmas
December 1813, Franco-Spanish border (short story) (1994) (revised edition published 2003)
20 Sharpe's Siege
Richard Sharpe and the Winter Campaign, 1814 (1987)
21 Sharpe's Revenge
Richard Sharpe and the Peace of 1814 (1989)
22 Sharpe's Waterloo
Richard Sharpe and the Waterloo Campaign, 15 June to 18 June 1815 (1990)
23 Sharpe's Ransom
December 1815, Normandy (short story) (1994) (revised edition published 2003)
24 Sharpe's Devil
Richard Sharpe and the Emperor, 1820–21 (1992)
He also wrote a wonderful collection of thrillers:
Wildtrack (1988)
Sea Lord (aka Killer's Wake) (1989)
Crackdown (1990)
Stormchild (1991)
Scoundrel (1992)
which are all set in the world of sailing.
And the three books he co-wrote with his wife are also excellent historical adventures:
A Crowning Mercy (1983)
Fallen Angels (1984)
Coat of Arms (aka The Aristocrats) (1986)
I have not yet read his other series.