If you have not seen this movie until now, check it out. It is wonderful.
Here is a Wired article on how some scenes in the movie were created.
Inside the Animatronic War Horse Used in Grisly Trench Scenes — www.wired.com — Readability
http-~~-//www.youtube.com/watch?feature=player_embedded&v=R6iEJnL2Ma8
http-~~-//www.youtube.com/watch?feature=player_embedded&v=F1QZS-ANyfs
Here is a Wired article on how some scenes in the movie were created.
Inside the Animatronic War Horse Used in Grisly Trench Scenes — www.wired.com — Readability
http-~~-//www.youtube.com/watch?feature=player_embedded&v=R6iEJnL2Ma8
http-~~-//www.youtube.com/watch?feature=player_embedded&v=F1QZS-ANyfs