Major Henry Percy was aide-de-camp to Sir John Moore at Corunna and to the Duke of Wellington at Waterloo. He was responsible for bringing the news of Wellington's victory at Waterloo to the Prince Regent in London. By November 1806 Henry Percy was a Captain in the 7th Fusiliers and in 1810 transferred to the 14th Light Dragoons. He was taken prisoner during the retreat from Burgos in 1812. After the battle of Waterloo, he arrived in London on the evening of 21 June, bringing home the Waterloo dispatches and captured French eagles.