It is also loosely based on Confederate States Army General Joseph Orville Shelby's factual escape to Mexico after the American Civil War (1861–1865), and his attempt to join with Maximilian's Imperial Mexican forces.
It draws inspiration from the real-life escape of Confederate General Joseph Orville Shelby to Mexico after the American Civil War (1861–1865), as well as his attempt to join forces with Maximilian's Imperial Mexican army.