This movie is a strange combination of Disney and Spielberg, although the latter is responsible. The story is wildly unbelievable. We follow a fictional horse from the day it's born. It doesn't look good for the horse until he is bought by a poor farmer whose son has always adored the colt. He names his horse Joey. So far this is Disney.
Then World War I breaks out and throughout the British countryside young men are volunteering and the army is looking for horses. Dad sells Joey to be a war horse. Now the Spielberg begins. I won't spoil the story for you if you haven't seen it and still want to, but the rest of the movie is just plain fairy tale with graphic details. There are horrible scenes of cruelty to animals and civilians and soldiers; it is a war movie after all. I should have known that those war scenes, although probably fairly realistic except for Joey's part in it, would be too much for me.
If, like me, you can't bear to watch people and animals on the front lines of a brutal war, I suggest you pass on this movie. If, unlike me, you can keep in mind that it's just a movie, maybe you'll want to try it. This is merely my opinion, and fair warning.