There is little documentation to the thoughts of the main characters during the days leading up to the Battle of Gettysburg, so author Michael Shaara fictionalized this aspect of his Pulitzer Prize-winnning novel. As for the film version of Gettysburg, the screenplay actually maintains most of the characters, dialogue and scenes found in The Killer Angels. Much of the dialogue, particularly several of Chamberlain's speeches, are word-for-word from the book. Though the end result of the movie was a far cry from the outstanding novel from which it originated, the film did maintain the general tone and feel of Shaara's book. My biggest complaint about the film was the casting of Martin Sheen as Robert E. Lee and the terrible, fake beards worn by many of the characters, particularly that of Tom Berenger, who played James Longstreet.