The 104th Illinois Infantry under Marching Okdeus.—The Ottawa Republican of the 2Sth says that a dispatch has been received announcing that the 104th Illinois infantry, Col. Moore, which was captured at Hartsville, Tenru, is under orders to march to Kentucky immediately, to assist in repelling the supposed invasion of that State. The regiment is now at Camp Douglas, and this information will he highly satisfactory to the hoys.