[1] Picton served during the Peninsular War in Portugal and Spain.

He was the highest-ranking British Army officer to die at the Battle of Waterloo, the final Allied victory over Napoleon that ended the Napoleonic Wars.

[2] Several versions of the painting exist with one at Apsley House, the home of Picton's long-standing commander the Duke of Wellington.

[3] The copy in the National Gallery of Art in Washington D.C. was acquired in 1961.

[4] Picton had previously been painted by the Irish artist Martin Archer Shee in 1812, which is now in the collection of the National Portrait Gallery in London.