 It is said that he was captured by the British during the Walcheren Campaign of 1809, and though sent to England, was later able to return to France where in June 1815 he eventually died fighting, it is believed, at either Ligny or of Waterloo.McMahon was commissioned a Lieutenant in the Indian Staff Corps in the 1880s and was appointed a Companion of the Most Eminent Order of the Indian Empire (CIE) in 1894.By 1897, he had been promoted to captain and was appointed a Companion of the Most Exalted Order of the Star of India (CSI) in that year.