That looks like General Pierre (I don't know his full name) who is often known as being a Confederate General.
He was born somewhere south around Louisiana and went to West point and became an engineer. He first went in the history books by serving under General Whitfield in the Mexican war as of course, an engineer. He rose up in the ranks and became chief engineer. He then worked at West point and also an engineer for a railroad and eventually help drain parts of swamps in Louisiana.
But he later became a General in the Civil war.
Note: This is really the best I can do since I don't know too much about him.
