What is the name of that children's book about a cannon that takes place during the Civil War?

What is the name of that childrens book about a cannon that takes place during the Civil War?

What is the name of that children's book about a cannon that takes place during the Civil War?
There was a book called "Rifles for Watie" by Harold Keith that was written in the 50's and is still available. I read it when I was a kid (in the 50's) and it was about a boy who went off to fight in the Civil War. I recall enjoying it. It's not a cannon, but a rifle...