Here's an image of his obituary.
Believe it or not, he was not the only Civil War veteran to serve in the First World War. In 1917, the U.S. Army brought Major General Peter Coonover Hains out of retirement to serve as a chief engineer for the Eastern Seaboard defenses. He was 76 years old at the time. Hains began his service in 1857 when he entered West Point. Graduating in 1861, he served in the United States Army as an engineer. He ended the war as a 24-year old lieutenant colonel, but retired in 1904 as a brigadier general.