Isaac Duncan was born in December 1840. He enlisted in the 48th Regiment, Co. E, OVI, on September 19, 1861, at the age of 21. He was a Sergeant when he was killed in action at the battle of Shiloh on April 6, 1862.
The West Milton, Miami County, Ohio, Duncan G.A.R. Post 477 was named in the honor of Isaac, who was a native of Union Township. The picture above hung in the GAR post until the post was abandoned due to its thinning ranks. It then belonged to the Duncan family. Dr. William Duncan donated the picture of Isaac and a gavel, which the post commanders had used, to the Union Township Heritage Association. They both can be seen in the Quaker Heritage Museum in West Milton. It is said the gavel was made from wood obtained from Libby Prison. The gavel had been given to William Duncan (Isaac's great-nephew) by the post when William was 7 or 8 years old.