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Continue to Chat[There, in War Horse] very little CGI. What happened there - because the horse was running very close to the trench, we had a rider. So in few instances, we had a rider dressed in a green suit. The rider would guide the horse through the frame, and through CGI [we removed] the rider. But that's about it. - Janusz Kaminski from https://whatsmyquote.com/quote/there-in-war-horse-very-little-cgi-what-happened-there-because-the-horse-was-running-very-close-to-the-trench