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. 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. When they have to tackle the pulling of the German Guns Topthorn starts to loose strength and soon dies.