general sir arthur james lyon fremantle (11 november 1835 – 25 september 1901) was a british army officer and a notable british witness to the battle of gettysburg during the american civil war. whilst holding the rank of "captain and lieutenant colonel" he spent three months (from 2 april until 16 july 1863) in north america, travelling through parts of the confederate states of america and the union. contrary to popular belief, colonel fremantle was not an official representative of the united kingdom; instead, he was something of a tourist.