Question: What is the series number of the true novel that details Sharpe 's involvement in the 1810 British retreat through Portugal ?

text: Sharpe (novel series)
Novels , short stories , and non-fiction
The first book was written in 1981 , with Richard Sharpe in Spain at the Talavera Campaign in 1809 . The next seven books were written in order up to Sharpe 's Siege in 1814 . The novel Sharpe 's Rifles was written next , set earlier in 1809 at the time of the retreat from Corunna , Spain . The next four books follow on from Sharpe 's Siege up to Sharpe 's Devil , set in 1820–21 . Then came Sharpe 's Battle set between Sharpe 's Gold and Sharpe 's Company ( set in 1811 ) . Cornwell then moved to the beginning of Sharpe 's army career in British India with Sharpe 's Tiger set in 1799 , beginning a series of three books , closing with Sharpe 's Prey set in 1807 . Cornwell followed this with two novels and four short stories which lie between Sharpe 's Rifles ( 1809 ) and Sharpe 's Devil ( 1820–21 ) . Cornwell published the non-fiction book Waterloo : The History of Four Days , Three Armies and Three Battles in September 2014 , timely for the 200th anniversary of the Battle of Waterloo . [ 1 ]
Sharpe is a series of historical fiction stories by Bernard Cornwell centered on the character of Richard Sharpe. The stories formed the basis for an ITV television series featuring Sean Bean in the title role. Cornwell's series is composed of several novels and short stories, and charts Sharpe's progress in the British Army during the Napoleonic Wars. He begins in Sharpe's Tiger as a private in the 33rd Regiment of Foot who becomes a sergeant by the end of the book; he is an ensign in the 74th Regiment during Sharpe's Trafalgar who is transferred to the newly formed 95th Rifles as a second lieutenant. He is gradually promoted through the ranks, finally becoming a lieutenant colonel in Sharpe's Waterloo. The character of Sharpe is born a guttersnipe in the rookeries of London, and the stories dramatize his struggle for acceptance and respect from his fellow officers and from the men whom he commands. He is commissioned an officer on the battlefield and overcomes class in an army where an officer's rank is often bought. He is an experienced soldier, unlike many of the officers with whom he serves. His adventures result in his improbable presence at nearly every important event in the British Empire at the end of the 18th and beginning of the 19th Centuries. Sharpe is described as brilliant but wayward in Sharpe's Sword, and he is portrayed by the author as a loose cannon. He is a highly skilled leader of light troops who takes part in a range of historical events during the Napoleonic Wars and other conflicts, including the Battle of Waterloo. He is considered dangerous to have as an enemy; he is a skilled marksman and grows to be a good swordsman.
Series No Title Sub-title First published
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
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
20 Sharpe 's Siege Richard Sharpe and the Winter Campaign , 1814 1987