Viggo Mortensen is reuniting with Ed Harris, his A History of Violence co-star, and Diane Lane, whom he worked with in Walk on the Moon, for a new western titled Appaloosa. Harris will not only co-star but will direct as well. Mortensen, an avid rider, owns horses from two movies he’s starred in—Hidalgo, about the relationship between a cowboy and his horse, and The Lord of the Rings trilogy. Producers are currently looking for an equine co-star. Filming is scheduled to begin in the fall.