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 Douro was selected by him to proceed to the headquarters of the Spanish general, Cuesta, to make arrangements for the co-operation of the English and Spanish armies in the forthcoming campaign on the Tagus. He was afterwards present at the battle of Talavera. When the 71st Highlanders, then recently transformed into a light infantry corps, arrived out in Portugal in the summer of 1810, Cadogan joined it at Mafra and assumed command in succession to Colonel Peacocke. At its head he distinguished himself on various occasions during the subsequent campaigns, particularly at Fuentes de Onoro, 5 May 1811, when he succeeded to the command of a brigade consisting of the 24th, 71st, and 79th regiments (, iv. 797–8), at Arroyo dos Molinos 28 Oct. 1811 (ib. v. 13, 354–6), and at Vittoria, 21 June 1813, where he fell. On the latter occasion the 71st was ordered to storm the heights above the village of Puebla, whereon rested the French left. While advancing to the charge at the head of his men Cadogan was mortally wounded. At his request he was carried to a neighbouring eminence, whence he witnessed the success of the charge before he expired. The incident is represented on the public monument by Chantry, erected to the memory of Cadogan in St. Paul's, for which the House of Commons voted the sum of 1,575l. Monuments were also erected to him in Chelsea parish church and in Glasgow cathedral. Cadogan, who was in his thirty-fourth year and unmarried, was much esteemed both in private life and professionally, and Lord Wellington, although an intimate personal friend, simply expressed the general feeling of the army when he wrote of his great merit and tried gallantry in his Vittoria despatch (ib. vi. 539, 545–6).

 CADOGAN, WILLIAM (1601–1661), major of horse under the Commonwealth and governor of Trim, was eldest son of Henry Cadogan of Llanbetter, and great-grandson of Thomas Cadogan of Dunster, Somersetshire, who in his will, dated 12 June 1511, styles himself 'valectus corone,' and is credited by many genealogists with descent from the ancient princes of Wales [see ]. William Cadogan was born at Dunster in 1601, and accompanied the Earl of Strafford to Ireland, where he was serving as a captain of horse in 1641. In 1649 he reappears as a major of horse in Cromwell's army in Ireland, and for his services in the revolted districts round Dublin, and especially against the Irish chieftains Phelim O'Neill and Owen O'Rowe, was rewarded with the governorship of the castle and borough of Trim, co. Meath, which he held until his death, 14 March 1661. A monument to him, stated by some writers to be at Trim and by others in Christ Church, Dublin, bears or bore a lengthy Latin inscription, transcribed in Collins's 'Peerage,' vol. v., which sets forth these and other particulars of him. Cadogan had a son Henry, a barrister settled in Dublin, who married Bridget, daughter of Sir Hardress Waller, and by her had three children. The eldest of them, William, became a distinguished soldier, and was Marlborough's most trusted lieutenant [see, first earl].  CADOGAN, WILLIAM, first (1675–1726), general, colonel 1st foot guards, was eldest son of Henry Cadogan, counseUor-at-law, of Dublin, and grandson of Major William Cadogan, governor of Trim [see, major]. He was born in 1675 (see, Baronage), and is said to have fought as a boy cornet in King William's army at the passage of the Boyne. He obtained a commission in one of the regiments of Inniskilling dragoons, afterwards known as the 5th royal Irish dragoons (revived in 1858 as the 5th royal Irish lancers), with which he served under King William in the Irish and Flanders campaigns, and attracted the notice of Marlborough, who was twenty-five years his senior. When troops were sent from Ireland to Holland in 1701, Cadogan, then a major in the royal Irish dragoons, accompanied them as quartermaster-general. He was employed on special duty at Hamburg and elsewhere later in the same year, in connection with the movement of the Danish and Wurtemburg troops into Holland (Hist. MSS. Comm. 3rd Rep. 189-90). In April 1702, a month after King William's death, Marlborough was appointed generalissimo of the confederate armies, and fixed his head-quarters at the Hague, taking as his quartermaster-general Cadogan, who became his most trusted subordinate. Cadogan's services in the ensuing campaign, ending with the fall of Liège and the retreat of the French behind the Mehaigne, were rewarded, on 2 March 1703, with the colonelcy of the regiment with which his name is chiefly identified, the 6th (later 2nd Irish) horse, (the present 5th dragoon guards), which became famous as 'Cadogan's Horse.' In the winter of 1703-4 Cadogan was in England organising reinforcements. He returned to 