Charles Mason is primarilly remembered as an attorney. He presumably served some length of time in the U. S. Army before the Civil War, as he was in the West Point class of 1829, along with Robert E. Lee.
While Lee continued his military career, first in the U. S. Army and later resigning to join the Confederacy, there is no indcation in Wikipedia that Mason was still soldiering in 1861.
Chat with our AI personalities
Besides becoming the border between Maryland and Pennsylvania, Charles Mason and Jeremiah Dixon's line became what separated the states that allowed slavery (Confederate; south) and the states that didn't (Union; north)
Confederate and Union Boundary IMPROVEMENT The Mason-Dixon line
confederate
the union. about 350,000 on the union side about 250,000 on the confederate side
Union.