Thomas Scott Allen was born on July 26, 1825 in Andover, New York. He attended Oberlin College, then moved to Iowa County, Wisconsin, where he was a surveyor, miner, and teacher. In 1857 he became a member of the Wisconsin State Legislature, and also served as a clerk in Madison, Wisconsin and as a militia member.
In 1861 he enlisted in the Governor’s Guards, eventually becoming a Captain in the 2nd Wisconsin Infantry Regiment . He participated in the battles of Bull Run, Gainesville, and Antietam, where he was wounded on September 17, 1862.
He became Colonel of the 5th Wisconsin Infantry Regiment on January 26, 1863, commanding the regiment at Marye’s Heights, Rappahannock Station, where he was wounded for a second time on November 7, 1863, and Petersburg. He mustered out on August 2, 1864. For his service he was brevetted Major General of United States Volunteers at the end of the war.
In 1866 Allen was elected Wisconsin Secretary of State on the Republican ticket for a four-year term. In 1869 he helped organize the Grand Army of the Republic in Wisconsin, and served as commander of the Wisconsin department for two years.
In 1870 he moved to Oshkosh, becoming a partner in the Oshkosh Northwestern until 1884. From 1885 until 1902 he published the Wisconsin Telegraph, a German newspaper. He died on December 12, 1905 in Oshkosh, Wisconsin.
Raus, Edmund J., A Generation on the March: The Union Army at Gettysburg
Dictionary of Wisconsin Biography