Under the Empire, Lefebvre-Desnouettes fought with distinction at the
Battle of Elchingen in 1805. Later that year, he became colonel after the
Battle of Austerlitz. He served also in the Prussian campaigns of 1806–1807. He was promoted to
general of brigade in September 1806 and
general of division in November 1807. He was created a count of the Empire in March 1808. Sent with the army into Spain, he conducted the first and unsuccessful
Siege of Saragossa. Later he commanded the IV Corps in several actions in Spain. On 29 December 1808, he was taken prisoner in the action of
Benavente by the British cavalry under
Henry Paget (later Lord Uxbridge, and subsequently Marquess of Anglesey). For over two years Lefebvre-Desnouettes remained a prisoner in
England, living, on
parole from
Norman Cross Prison, at
Cheltenham with his wife Stephanie. In 1811 he broke his parole, an act which greatly offended British public opinion, and escaped; in the invasion of
Russia in 1812, he led the Guard
Chasseurs à cheval cavalry. In 1813 and 1814, he and his men distinguished themselves in most of the great battles, especially
Brienne (where he was wounded),
La Rothière,
Montmirail,
Vauchamps and
Arcis-sur-Aube. He joined Napoleon in the
Hundred Days and was appointed commander of the Guard Light Cavalry Division, which he commanded at the
Battle of Quatre Bras. At the
battle of Waterloo he was taken prisoner and placed under the guard of a single Dragoon, on his solemnly pledging his honour that he would not attempt to escape. When the Dragoon had taken him to the place where he was to be received, and had taken the saddle off his own horse, the General clapped spurs to his horse, and rode off, but the Dragoon, as quick as lightning, followed him on horseback, gave him a cut with his sabre on the forehead, and brought him back. ==Later career and death==