^^^...the story of which is documented in an historical novel, Killer Angels, by Michael Shaara, and the movie, Gettysburg, by Ted Turner, starring Michael Sheen as Robert E. Lee and Jeff Daniels as Col. Chamberlain.
The book is perhaps the best book I've ever read, well worth the time and money to track down and read. The movie, likewise. Turner used reenactors extensively for the battle scenes, and in some cases (in particular, Picket's Charge) many of the actors were descendents of the original soldiers. One of the CD releases of the movie contains an extensive documentary about making the movie and the participants.