Grand Army of the Republic
Thaddeus Stevens Clarkson, the new Commander in Chief, was born at Gettysburg, Penn., in 1840. He was educated three miles from the battlefield of Antietam. He enlisted April 16, 1861, within two hours after the appearance of President Lincoln's call for 75,000 men for three months, in Company A, First Illinois Artillery. He went to Cairo, served under Gen. Grant there. re-enlisted for the war July 16, 1861, was promoted Dec. 1, 1861 to Adjutant of the Thirteenth Illinois Cavalry; served with that regiment and on the staff of Gen. John W. Davidson, participating in the battles with that command on the march to Helena and Little Rock, Ark. He was assigned to the command during the Arkansas campaign. He assisted in raising the Third Arkansas Cavalry of Union white men, was promoted to Major, and commanded the regiment until nearly the close of the war, participating in most of the battles in Arkansas under Gen. Steele. In 1862 he was married to Mary Beecher Matterson, and has five children. He has been on the Executive Committee of the G.A.R., for three consecutive years, and was elected Department Commander of the Nebraska by acclamation in 1890. He is also Commander of the Loyal Legion of Nebraska.
The New York Times, Sept. 5, 1896
He also was elected May 23, 1898 as General Manager of the Trans-Mississippi International Exposition, and served as Postmaster in Omaha, NE.
He died in Newberg, Oregon on Jan 17, 1915, and is buried in the Prospect Hill Cemetery, Omaha, Nebr.