War Horse travels from the verdant English countryside to the fields of France and Germany at the outbreak of World War I. A boy's beloved horse has been sold to the cavalry and shipped to France. Caught up in enemy fire, the horse serves on both sides of the war, and survives an odyssey that leaves him alone in no-man's land. The boy, now a young man, cannot forget his horse, and embarks on a treacherous mission to find him and bring him home.