In 1868 David Thompson served in the state senate representing Clackamas County as a Republican .
With the outbreak of the Civil War , Thompson enlisted in the Army where he rose to the rank of captain in the First Oregon Cavalry .
In 1868 Thompson   served in the state senate representing Clackamas County as a Republican .
With the outbreak of the Civil War , Thompson enlisted in the Army where he rose to the rank of captain in the First Oregon Cavalry .