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General William Carr Beresford, 1st Viscount Beresford, 1st Marquis of Campo Maior, was an Anglo-Irish soldier and politician. A general in the British Army and a Marshal in the Portuguese Army, he fought alongside the Duke of Wellington in the Peninsular War and held the office of Master-General of the Ordnance in 1828 in the First Wellington ministry. He led the 1806 failed British invasion of Buenos Aires.