The man on the motorcycle says England is at war with Germany
Explanation:
War horse is a movie from the American studios. The movie is all about the country England going at war against Germany in the world war 1. When this war happened, there were sacrifices made by the horses in the war.
The soldiers and the war men who were riding on the horses, led to the sacrifices of these innocent animals. This was the main concept and idea of the movie. Thus it was given the name war horse because it was about the horses of the war.
