Topthorn is a sleek fully black large horse. He is met by Joey, when he first ends up in the British Cavalry.Major Jamie Stewart, is the rider of Topthorn. When they do a battle charge, Captain Jamie Stewart is captured from Topthorn's back. Throughout the tale, Joey & Topthorn became friends , and become loyal shoulder partners. When they have to tackle the pulling of the German Guns. They both end up on a french farm. Where they meet Emilie and her Granfather. Emilie was eager to ride one of the 'Big Horses' But chose Joey, as Topthorn was too big for her.