Union troops continued to organize and train at military camps in the city, as battles in Kentucky and Tennessee caused major changes to Indianapolis. After the battles of Fort Henry and Fort Donelson, the Union began to collect a large number of Confederate prisoners of war for transport to the North. Governor Morton volunteered to hold some of the prisoners at Indianapolis. Designated as one of four northern prisoner-of-war camps, Camp Morton was converted into one of the Union's largest prisons for captured Confederate soldiers.