The eldest son of Charles Mordaunt, 3rd Earl of Peterborough, he was educated at Christ Church, Oxford, after travelling in Holland in 1699.
He was a political ally of his father's and managed the attempt to impeach Lord Somers in the House of Commons in the same year.
As a captain, he led the forlorn hope of the 1st Foot Guards at the Battle of Schellenberg in 1704, and was one of the few to survive that bloody assault.
[1][3] On 25 August 1704, he was made colonel of the Scots Fuzileers in place of Brigadier Archibald Rowe, killed in the attack at Blenheim.
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