History
Six-Gun was the horse of the actor Sundown Dawson in the 1940's that Bucky was a huge fan of. When Bucky and Captain America visited Democracy Pictures for the filming of the "Adventures of Captain America" they parachuted directly onto the set that Sandown was filming in. Sundown and Six-Gun escorted them over to the correct set. After Captain America and Bucky stopped Lyle Dekker, they crashed into a river and Sundown and Six-Gun helped pull them out [1]