In addition to practicing law, Watson became active in the
Vermont National Guard; after initially serving as a lieutenant, in 1882 he was elected commander of a company called the Bradford Guards and promoted to
captain. When the Bradford area's 1883 Ely Copper Mine strike turned violent, Watson's company was employed to restore order, and was credited with ending the fighting by capturing the rioters' gunpowder and weapons. He was later promoted to
major as commander of 1st Battalion, 1st Vermont Infantry Regiment, and in 1895 he received promotion to
lieutenant colonel. In 1898, Watson was elected to serve as commander of the 1st Vermont Infantry Regiment with the rank of
colonel, but declined the position, which closed his military career. A
Republican, Watson served as
State's Attorney of
Orange County from 1886 to 1888, and was a member of the
Vermont Senate from 1892 to 1894. He was a member of the board of directors of the Bradford Savings Bank and Trust Company, and a member of the Bradford Academy Board of Trustees. ==Career as a judge==