But General McClellan did not yet move. The last long hour of the day passed. The sun set in red and gold behind the western mountains, and the Army of the Potomac still rested in its camp, although privates even knew that precious hours were being lost, and that booming cannon might already be telling the defenders of Harper's Ferry that Jackson was at hand. Nor were they far wrong. While McClellan lingered on through the night, never moving from his camp, Jackson and his generals were pushing forward with fiery energy and at dawn the next day had surrounded Harper's Ferry and its doomed garrison of more than twelve thousand men. But these were things that Dick could not guess that night. One small detachment had been sent ahead by McClellan, chiefly for scouting purposes, and in the darkness the boy who had gone a little distance forward with Colonel Winchester heard the booming of cannon. It was a faint sound but unmistakable, and Dick glanced at his chief. “That detachment has come into contact with the rebels somewhere there in the mountains,” he said, “and the ridges and valleys are bringing us the echoes. Oh, why in Heaven's name are we delayed here through all the precious moments! Every hour's delay will cost the lives of ten thousand good men!” And it is likely that in the end Colonel Winchester's reckoning was too moderate. He and Dick gazed long in the direction in which Harper's Ferry lay, and they listened, too, to the faint mutter of the guns among the hills. Before dawn, scouts came in, saying that there had been hard fighting off toward Harper's Ferry, and that Lee with the other division of the Southern army was retreating into a peninsula formed by the junction of the river Antietam with the Potomac, where he would await the coming of Jackson, after taking Harper's Ferry. “Jackson hasn't taken Harper's Ferry yet,” said Dick, when he heard the news. “Many of Banks' veterans of the valley are there, and, our men instead of being crushed by defeat, are always improved by it.” “Still, I wish we'd march,” said Warner. “I didn't come here merely to go into camp. I might as well have stayed in the hospital.” Nevertheless they moved at daylight. McClellan had made up his mind at last, and the army advanced joyfully to shut down the trap on Lee. Dick's spirits rose with the sun and the advance of the troops. They had delayed, but they would get Lee yet. There was nothing to tell them that Harper's Ferry had fallen, and Jackson's force must still be detained there far away. They ought to strike Lee on the morrow and destroy him, and then they would destroy Jackson. Oh, Lee and Jackson had been reckless generals to venture beyond the seceding states!