... Henry, on the 6th, General Grant did not move upon Donelson until the 12th, with fifteen thousand men, and was only reinforced to the number of twenty-five thousand on the evening of the 13th; while General Johnston could have been present with twenty-seven thousand men on the 10th, at the latest. No serious conflict occurred until the garrison itself attacked the Federals, on the 15th, and, in view of the bri...