Peninsula
During the campaign and Battle of Corunna in 1808–1809, he served as Sir John Moore's adjutant general. He was promoted to major-general in 1810.
During the remainder of the Peninsular War he commanded an infantry division under the Duke of Wellington. He was first appointed to command the 6th Division on 9 February 1812. During the Battle of Salamanca, his division played a key part by defeating French General Bertrand Clausel's counterattack. He then led his division in the Siege of Burgos campaign. From 26 January to 25 June 1813, Clinton was absent and Edward Pakenham took over the 6th Division. For his conduct in the Vitoria campaign, Clinton was made a knight of the Order of the Bath.
He was absent again from 22 July to October, when he again assumed command of the 6th Division. He was given the local rank of lieutenant general in 1813. He took part in the subsequent victories at the battles of the Nivelle, the Nive, Orthez and Toulouse. At the end of the Peninsular War he was made a lieutenant general and inspector-general of infantry, and was awarded the Army Gold Cross with one clasp.
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