As Jackson approached the place by way of Bolivar Heights, Walker occupied Loudon Heights and McLaws invested Maryland Heights. All were unopposed except McLaws, who encountered Colonel Ford with a force to dispute his ascent. Ford, however, after some resistance, spiked his guns and retired to the Ferry, where Colonel Miles had remained with the greater portion of the Federal troops. Had Miles led his entire force to Maryland Heights he could no doubt have held his ground until McClellan came to his relief. But General Halleck had ordered him to hold Harper's Ferry to the last, and Miles interpreted this order to mean that he must hold the town itself. He therefore failed to occupy the heights around it in sufficient strength and thus permitted himself to be caught in a trap. During the day of the 14th the Confederate artillery was dragged up the mountain sides, and in the afternoon a heavy fire was opened on the doomed Federal garrison. On that day McClellan received word from Miles that the latter could hold out for two days longer and the commanding general sent word: "Hold out to the last extremity. If it is possible, reoccupy the Maryland Heights with your entire force. If you can do that I will certainly be able to relieve you.... Hold out to the last." McClellan was approaching slowly and felt confident he could relieve the place. On the morning of the 15th the roar of Confederate artillery again resounded from hill to hill. From Loudon to Maryland Heights the firing had begun and a little later the battle-flags of A. P. Hill rose on Bolivar Heights. Scarcely two hours had the firing continued when Colonel Miles raised the white flag at Harper's Ferry and its garrison of 12,500, with vast military stores, passed into the hands of the Confederates. Colonel Miles was struck by a stray fragment of a Confederate shell which gave him a mortal wound. The force of General Franklin, preparing to move to the garrison's relief, on the morning of the 15th noted that firing at the Ferry had ceased and suspected that the garrison had surrendered, as it had. The Confederate Colonel Douglas, whose account of the surrender is both absorbing and authoritative, thus describes the surrender in "Battles and Leaders of the Civil War":