As the war progressed, shortly after the Battle of Shiloh a military hospital was established on the grounds of Camp Dennison, with over 200 beds situated in a series of wooden barracks. These wooden barracks were originally used to house soldiers, but were converted into hospital wards. There were considerably more men sent there over the course of the war. The nearby Waldschmidt Cemetery served as the temporary gravesite for 340 Union soldiers and 31 Confederate soldiers who were prisoners of war. The bodies were reinterred at Spring Grove Cemetery or at Camp Chase in Columbus in the late 1860s.

https://en.wikipedia.org/wiki/Camp_Dennison