They rode on through the same silence and desolation. They had no doubt that eyes watched them from groves and fence corners, keeping cautiously out of the way, because it was sometimes difficult now to tell Federals from Confederates. But it did not matter to Sherburne. He kept a straight course for the Potomac, at least half of his men knowing thoroughly every foot of the way. "What time can we reach the river and the place at which they say McClellan is going to cross?" asked Harry. "By midnight anyway," replied Sherburne. "Of course, we'll have to slow down as we draw near, or we may run square into an ambush. Do you see that grove about two miles ahead? We'll go into that first, rest our horses, and take some food." It was a fine oak grove, covering about an acre, with no undergrowth and a fair amount of grass, still green under the shade, on which the horses could graze. The trunks of the trees also were close enough together to hide them from anyone else who was not very near. Here the men ate cold food from their haversacks and let their horses nibble the grass for a half hour. They emerged refreshed and resumed their course toward the Potomac. In the very height of the afternoon blaze they saw a horseman on the crest of a hill, watching them intently through glasses. Sherburne instantly raised his own glasses to his eyes. "A Yankee scout," he said. "He sees us and knows us for what we are, but he doesn't know what we're about." "But he's trying to guess," said Harry, who was also using glasses. "I can't see his face well enough to tell, but I know that in his place I'd be guessing." "As we don't want him hanging on to our heels and watching us, I think we'd better charge him." "Have the whole troop turn aside and chase him?" "No; Harry, you and I and eight men will do it. Marlowe, take the rest of the company straight along the road at an easy gait. But keep well behind the hedge that you see ahead." Marlowe was his second in command, and taking the lead he continued with the troop. Marlowe rode behind one of the hedges, where they were hidden from the lone horseman on the hill, and Sherburne and Harry and the eight men followed. While they were yet hidden, Sherburne and his chosen band suddenly detached themselves from the others at a break in the hedge and galloped toward the horseman who was still standing on the hill, gazing intently toward the point where he had last seen the troop riding. Sherburne, Harry and the privates rode at a gallop across the field, straight for the Union sentinel. He did not see them until they had covered nearly half the distance, and then with aggravating slowness he turned and rode over the opposite side of the hill. Harry had been watching him intently, and when he had come much nearer the figure seemed familiar to him. At first he could not recall it to mind, but a moment or two later he turned excitedly to Sherburne.