Camp Dennison was a military recruiting, training, and medical post for the United States Army during the American Civil War. It was located near Cincinnati, Ohio, not far from the Ohio River. The camp was named for Cincinnati native William Dennison, Ohio's governor at the start of the war.With the outbreak of the Civil War in 1861, George B. McClellan, commander of Ohio's state militia, was charged by Governor Dennison with selecting a site for a recruitment and training center for southern Ohio, a possible target for the Confederate States Army due to its Ohio River location and proximity to slave states such as Kentucky and Virginia, from which invasions could be launched. McClellan was joined by Joshua H. Bates and another member of the militia in preparing the plans for the new camp. The site was actually chosen by then Captain William S. Rosecrans, who chose a level tract of land near Indian Hill, Ohio, 17mi from Cincinnati. The land was on both sides of the Little Miami Railroad (LMR) tracks, which ended at Cincinnati's Public Landing. There are variable area listed, but 700acre of land appears to have been rented from the Buckingham and Nimrod Price families. They were offered $12 to $20 per acre per month, a figure named without negotiation, and considered generous. Rosecrans laid out the camp via survey around April 24, 1861, and a large contingent of recruits from Camp Chase, numbering about 1,500 men were sent by train. The first post commander was Melancthon Smith Wade, a Cincinnatian who was a former general in the Ohio Militia.
