Exiled prisoners join forces with samurai clans on Tsushima Island to defend against the Mongol invasion of Japan in 1274, fighting Mongolian, Goryeo, and Jurchen forces.Exiled prisoners join forces with samurai clans on Tsushima Island to defend against the Mongol invasion of Japan in 1274, fighting Mongolian, Goryeo, and Jurchen forces.Exiled prisoners join forces with samurai clans on Tsushima Island to defend against the Mongol invasion of Japan in 1274, fighting Mongolian, Goryeo, and Jurchen forces.