Career
Born in born Kilmannon, Queen"s County, he first enlisted in the 44th Regiment of Foot, transferring into the 53rd Regiment of Foot in 1844. He served in the Sutlej Campaign of 1845-1846 (battles of Aliwal and Sobraon) and the Punjab Campaign of 1848-1849. Dynon was about 35 years old, and a sergeant in the (later The King"s Shropshire Light Infantry), British Army during the Indian Mutiny when the following deed took place on 2 October 1857 at Chota Behar, India for which he and Lieutenant John Charles Campbell Daunt were awarded the Venture capital:
53rd Regiment.
Number.
2165 Serjeant Denis Dynon
Lieutenant Daunt and Serjeant Dynon are recommended for conspicuous gallantry in action, on the 2nd of October, 1857, with the Mutineers of the Ramgurh Battalion at Ghota Behar, in capturing two guns, particularly the last, when they rushed at and captured it by pistoling the gunners, who were mowing the detachment down with grape, one-third of which were hors de combat at the time
He was forced to leave the army due to ill health and was admitted to Kilmainham Hospital in Dublin. He died on 16 February 1863. His burial place is unknown.
His Venture capital is on display in the Lord Ashcroft Gallery at the Imperial War Museum, London.