Two Trails Publishing has a booklet by John Hampton Hollingsworth reagrding this event its $10 on their website http://www.civilwarbooklady.com/bookcatalogA-C.html

As for your ancestor can you give us a bit more information, age, nativity, military unit he was with etc. The only Hardi/en Williams I came up with was a 2nd Lt with the Osage County Home Guard but he lived through the war.

Many Union dead from around the state were re-interred after the war at Jefferson Barracks in St. Louis.

John R.