I had thought that he had been captured at Resaca, initially, but this is confusing to me:

The Cherokee Artillery fought to save their guns but they were overwhelmed. In the Atlanta Campaign they (does "they" include Corput's Battery?) had no cannons, so their troops were parceled out to reinforce depleted companies. In December of 1864 they served in the Nashville Campaign. On April 12, 1865 the company was captured in the Battle of Salisbury, North Carolina along with the other 1,700 defenders by Stoneman's 16,000 Union troops. They were sent north to a prisoner-of-war camp at Camp Chase, Ohio where they were eventually paroled and sent home by October of 1865.

It sounds like the cannons were captured in Resaca but the men were not, and that the men were captured later in Salisbury, NC by Stoneman's Union troops.

Are records on the Union prisons that show the names of the prisoners held there?