The silence was very heavy upon Harry's nerves. Overhead great birds hovered on black wings, and when he saw them he shuddered. St. Clair saw them, too. "No pleasant sight," he said. "I feel stronger since I've had food and water, Harry, but I'm thinking that we're going to be besieged in this fort, and we're not overburdened with supplies. I wonder what the colonel will do." "He'll try to hold it," said Langdon. "He was sent here for that purpose, and we all know what the colonel is." "He will certainly stay," said Harry. After a good rest they resumed work with pick, shovel, and bayonet, throwing the earthworks higher and ever higher. It was clear to the three lads that Colonel Talbot expected a heavy attack. "Perhaps we have underrated our mill hands and mechanics," said St. Clair, in his precise, dandyish way. "They may not ride as well or shoot as well as we do, but they seem to be in no hurry about going back to their factories." Harry glanced at him. St. Clair was always extremely particular about his dress. It was a matter to which he gave time and thought freely. Now, despite all his digging, he was again trim, immaculate, and showed no signs of perspiration. He would have died rather than betray nervousness or excitement. "I've no doubt that we've underrated them," said Harry. "Just as the people up North have underrated us. Colonel Talbot told me long ago that this was going to be a terribly big war, and now I know he was right." A long time passed without any demonstration on the part of the enemy. The sun reached the zenith and blazed redly upon the men in the fort. Harry looked longingly at the dark green woods. He remembered cool brooks, swelling into deep pools here and there in just such woods as these, in which he used to bathe when he was a little boy. An intense wish to swim again in the cool waters seized him. He believed it was so intense because those beautiful woods there on the slope, where the running water must be, were filled with the Northern riflemen. Three scouts, sent out by Colonel Talbot, returned with reports that justified his suspicions. A heavy force, evidently from Patterson's army operating in the hills and mountains, was marching down the valley to join those who had been driven from the fort. The junction would be formed within an hour. Harry was present when the report was made and he understood its significance. He rejoiced that the walls of earth had been thrown so much higher and that the trenches had been dug so much deeper.