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Gods and Generals (2003) - 29 mistakes
Directed by Ronald F. Maxwell, starring Jeff Daniels, Mira Sorvino, Robert Duvall (add more)
Factual error: Throughout most of the movie, Lee and Jackson are riding the wrong horses. Traveller was a dapple grey horse with dark grey mane and tail, and Little Sorrel was a dark rust-colored horse with a white star on his face. In the movie, Lee is shown riding a white horse with white mane and tail. At the beginning of the movie, Jackson's horse is correctly depicted as a sorrel with a white star. Then Jackson's horse is switched to a red chestnut with white blaze and four white socks.
Factual error: The Confederate camp before the July 1861 Battle of Bull Run has shelter tents (AKA pup tents). These tents were first used by the Union army in late spring 1862. Conversely, the Union Army of the Potomac at Chancellorsville in May of 1863 is using common tents - the kind replaced by the shelter tent a year earlier.
Factual error: Throughout the movie, you'll notice some soldiers who are slightly plump, and others that are just plain fat (such as the "Santa-sized" Confederate soldier receiving the rifle from what one would assume to be a gunsmith). Because of strenuous marching and poor supplies (especially in the case of the Confederate army), by the time the Battle of First Bull Run came around, it would be highly unlikely that any of the soldiers would be as fat as those in the movie.
Revealing: Towards the end of the movie, as Jackson's Corps is attacking the exposed Federal right flank during the Battle of the Wilderness, when the Confederate forces begin overrunning the Federal encampment, they sweep past two artillery pieces. Notice the second gun - it has a blocked barrel (filled with concrete). Must have been a memorial piece that was on/near the Wilderness battlefield.






