<diacritize> Retrieved October 26, 2011. Steven Spielberg starts filming War Horse on Dartmoor by Tristan Nichols, The Herald August 3, 2010 War Horse Rotten Tomatoes. <yor>Retrieved October 26, 2011. Steven Spielberg starts filming War Horse on Dartmoor by Tristan Nichols, The Herald August 3, 2010 War Horse Rotten Tomatoes. 