Sherburne did not exaggerate. Hitherto the war had never really touched the soil of any of the free states, but now it became apparent that Pennsylvania, the second state of the Union in population, would be invaded. Excitement seized Harrisburg, its capital, which Lee's army might reach at any time. People poured over the bridges of the Susquehanna and thousands of men labored night and day to fortify the city. Jenkins, a Southern cavalry leader, was the first to enter Pennsylvania, his men riding into the village of Greencastle, and proceeding thence to Chambersburg. While the telegraph all over the North told the story of his coming, and many thought that Lee's whole army was at hand, Jenkins turned back. His was merely a small vanguard, and Lee had not yet drawn together his whole army into a compact body. The advance of Lee with a part of his army was harassed moreover by the Northern cavalry, which continued to show the activity and energy that it had displayed so freely at Pleasanton's battle with Stuart. Harry, besides bearing messages for troops to come up, often saw, as he rode back and forth, the flame of firing on the skyline, and he heard the distant mutter of both rifle and cannon fire. Some of these engagements were fierce and sanguinary. In one, more than a thousand men fell, a half to either side. Harry was shot at several times on his perilous errands, and once he had a long gallop for safety. Then Lee stopped a while at the Potomac, with his army on both sides of the river. He was waiting to gather all his men together before entering Pennsylvania. Already they were in a country that was largely hostile to them, and now Harry saw the difficulty of getting accurate information. The farmers merely regarded them with lowering brows and refused to say anything about Union troops. Harry had parted company for the time with his friends of the Invincibles. They were far ahead with Ewell, while he and Dalton remained with Lee on the banks of the Potomac. Yet the delay was not as long as it seemed to him. Soon they took up their march and advanced on a long line across the neck of Maryland into Pennsylvania, here a region of fertile soil, but with many stony outcrops. The little streams were numerous, flowing down to the rivers, and horses and men alike drank thirstily at them, because the weather was now growing hot and the marching was bad. It was near the close of the month when Harry learned that Hooker had been relieved of the command of the Army of the Potomac at his own request, and that he had been succeeded by Meade. "Do you know anything about Meade?" he asked Dalton. "He's been one of the corps commanders against us," replied the Virginian, "and they say he's cautious. That's all I know." "I think it likely that we'll find out before long what kind of a general he is," said Harry thoughtfully. "We can't invade the North without having a big battle."