The Million Dollar Dixie Deliverance (1978)

A Confederate officer kidnaps for a $1,000,000 ransom five well-to-do children from a Yankee boarding school; a wounded black Union soldier helps them escape after they perform the necessary surgery to remove the bullet from his leg. But they are captured again, and it takes a lucky Union army attack to save them.

Unfortunately the movie The Million Dollar Dixie Deliverance is not yet available on HBO Max.