In December 1862, Moore, colonel in the Fourth Illinois Infantry, was among those put in charge of the Federal 39th Brigade in the absence of Colonel Joseph Scott. While in camp outside Hartsville, Tennessee, the small force was taken by surprise by Confederate forces under Colonel John Hunt Morgan. Moore's regiment was captured and sent to Camp Douglas, Chicago, Illinois., and duty there as paroled prisoners of war till April, 1863, when declared exchanged.
