Warhorse by Michael Morpurgo:

The story takes place in WWI. More or less by chance, Joey, a beautiful young stallion, ended up on Albert’s father’s farm.

The close bond between Albert and the horse is broken when the animal goes to France with the English troops to do its part in the First World War.

After terrible war experiences, Joey and Albert are reunited in 1918.

This history of friendship between man and animal is described from the horse’s point of view;

it does not diminish the horrors of that trench warfare.