"The important point is not whether I can escape you, but whether you can escape me. Since you have lost your boat and your rifle and we're in such a treacherous and unstable element as water, I occupy the superior position. The young may indeed over-estimate their powers, but in swimming at least I'm a competent critic. For instance, you're holding your shoulders too high, and you kick too much. You're splashing water, a useless waste of energy. Now observe me. The surface of this river is rough. Little waves are yet running upon it, but I float as easily as a fish, come up to see by the moon what time it is. It is not egotism on my part, merely a recognition of the facts, but I warn you, Mr. Shepard, to swim to the other shore and let me alone."

The two were not ten feet apart, and, despite the lightness of their talk, their eyes burned with eagerness and intensity. Harry knew that Shepard would not dream of turning back. Yet in the water he awaited the result with a confidence that he would not have felt on land.

"It's your move, Mr. Shepard," he said.

The intensity of Shepard's gaze increased, and Harry never took his eyes from those of his enemy. He intended like a prize fighter to read there what the man's next effort would be.

"I don't see that it's my move," said Shepard, as he floated calmly.

"You're following me for the purpose of capturing me."

"To capture you, or delay you. Meanwhile, it seems to me that I'm delaying you very successfully. I can't see that you're making much progress towards Lee."

"That depends upon which way this river is flowing. You note that we float gently with the stream."

"It's a poor argument. The Potomac flows directly by Washington, and if we were to float on we'd float into the heart of great Northern fortresses instead of Lee's camp."

"That's true as far as it goes, but it doesn't go far enough. I'm leaving the river soon. You can have it all then."

"Thanks, but I think I'll go with you, Lieutenant Kenton."

"Then come to the bottom!" exclaimed Harry, as he dived forward like a flash, seized Shepard by the ankles and headed for the bottom of the river with him. The water gurgled in his eyes and ears and nose, but he held on for many seconds, despite the man's desperate struggles. Then he was forced to let go and rise.

As his head shot above the stream he saw another shooting up in the same manner about fifteen feet away. Both were choked and gasping, but Harry managed to say:

"I didn't intend for you to come up so soon."

"I suppose not, but perhaps you didn't pause to think that when you rose I'd rise with you."

"Yes, that's true. It seems to me that matters grow complicated. Can't you persuade yourself, Mr. Shepard, to go and leave me alone? I really have no use for you here."

"I'd like to oblige you, Lieutenant Kenton, but I intend to see that you don't reach General Lee."

"Still harping upon that? It seems to me that you're a stupidly stubborn man. Don't you know that I'm going anyhow?"

Harry had never ceased to watch his eyes, and he saw there the signal of a coming movement. Shepard dived suddenly for him, intending to repeat his own trick, but the youth was like a fish in the water, and he darted to the right. The man came up grasping nothing. Harry laughed. The chagrin of Shepard compelled his amusement, although he liked the man.

"I wish you'd go away, Mr. Shepard," he said. "On land you could, perhaps, overpower me, but in the water I think I'm your master. All through my boyhood I devoted a great deal of my time to swimming. Dr. Russell of the Pendleton Academy—but you never knew him—used to say that if I would swim less and study more I could make greater pretensions to scholarship."

Shepard, swimming rather easily, regarded him thoughtfully.

"While we talk to each other in this more or less polite manner, Mr. Kenton," he said, "we must not forget that we're in deadly earnest. I mean to take you, and our scouts mean to take every other messenger who goes out from Colonel Sherburne's camp. You know, and I know, that if the Army of Northern Virginia does not reach in a few days that camp, where there is a ford in ordinary weather, it will be driven up against the Potomac and we can accumulate such great forces against it that it cannot possibly escape. Even at Sherburne's place its escape is more than doubtful, if it has to linger long."

"Yes, I know these things quite well, Mr. Shepard. I know also, as you do, that General Meade's army is not in direct pursuit, and, that in a flanking movement, he is advancing across South Mountain and toward Sharpsburg. It is a march well calculated and extremely dangerous to General Lee, if he does not hear of it in time. But he will hear of it soon enough. A comrade of mine, George Dalton, will tell him. Others from Colonel Sherburne's camp will tell him, and I mean to tell him too. I hope to be the first to do so."

Harry never deceived himself for a moment. He knew that although Shepard liked him, he would go to the uttermost to stop him, and as for himself, while he had a friendly feeling for the spy, he meant to use every weapon he could against him. Realizing that he could not linger much longer, as the chill of the water was already entering his body, he swam closer to Shepard, still staring directly into his eyes. How thankful he was now for those innumerable swimmings in the little river that ran near Pendleton! Everything learned well justifies itself some day.

Although there was but little moonlight they were so close together that they could see the eyes of each other clearly, and Harry detected a trace of uneasiness in those of Shepard. A good swimmer, the water nevertheless was not his element, and although a man of great physique and extraordinary powers, he longed for the solid earth under his feet.

Harry drew himself together as if he were going to dive, but instead of doing so suddenly raised himself in the water and shot forth his clenched tight fist with all his might. Shepard was taken completely by surprise and he sank back under the water, leaving a blood stain on its surface. Harry watched anxiously, but Shepard came up again in a moment or two, gasping and swimming wildly. The point of his jaw was presented fairly and Harry struck again as hard as he could in the water. Shepard with a choked cry went under and Harry, diving forward, seized his body, bringing it to the surface.

Shepard was senseless, but getting an arm under his shoulders Harry was able to swim with him to the northern shore, although it took nearly all his strength. Then he dragged him out upon the bank, and sank down, panting, beside him.

The great Civil War in America, the greatest of all wars until nearly all the nations of Europe joined in a common slaughter, was a humane war compared with other wars approaching it in magnitude. It did not occur to Harry to let Shepard drown, nor did he leave him senseless on the bank. As soon as his own strength returned he dragged him into a half-sitting position, and rubbed the palms of his hands. The spy opened his eyes.

"Good-by, Mr. Shepard," said Harry. "I'm bound to leave before you recover fully because then I wouldn't be your match. I'm sorry I had to hit you so hard, but there was nothing else to do."

"I don't blame you. It was man against man."

"The water was in my favor. I'm bound to admit that on land you'd have won."

"At any rate I thank you for dragging me out of the river."

"You'd have done as much for me."

"So I would, but our personal debts of gratitude can't be allowed to interfere with our military duty."

"I know it. Therefore I take a running start. Good-by."

"We'll meet again."

"But not on this side of the Potomac. It may happen when the Army of Northern Virginia and the Army of the Potomac go into battle on the other side of the river."

Harry darted into the forest, and ran for a half-hour. He meant to put as much distance as possible between Shepard and himself before the latter's full strength returned. He knew that Shepard would follow, if he could, but it was not possible to trail one who had a long start through dark and wet woods.

He came through the forest and into a meadow surrounded by a rail fence, on which he sat until his breath came back again. He had forgotten all about his wet uniform, but the run was really beneficial to him as it sent the blood leaping through his veins and warmed his body.

"So far have I come," said Harry, "but the omens promise a hard march."

He had his course fixed very clearly, and a veteran now in experience, he could guide himself easily by the moon and stars. The clouds were clearing away and a warm wind promised him dry clothing, soon. Long afterward he thought it a strange coincidence that his cousin, Dick Mason, in the far South should have been engaged upon an errand very similar in nature, but different in incident.

He crossed the meadow, entered an orchard and then came to a narrow road. The presence of the orchard indicated the proximity of a farmhouse, and it occurred to Harry that he might buy a horse there. The farmer was likely to be hostile, but risks must be taken. He drew his pistols. He knew that neither could be fired after the thorough wetting in the river, but the farmer would not know that. He saw the house presently, a comfortable two-story frame building, standing among fine shade trees. Without hesitation he knocked heavily on the door with the butt of a pistol.

He was so anxious to hasten that his blows would have aroused the best sleeper who ever slept, and the door was quickly opened by an elderly man, not yet fully awake.

"I want to buy a horse."

"Buy a horse? At this time of the night?"

He was about to slam the door, but Harry put his foot over the sill and the muzzle of his pistol within six inches of the man's nose.

"I want to buy a horse," he repeated, "and you want to sell one to me. I think you realize that fact, don't you?"

"Yes, I do," replied the man, looking down the muzzle of the big horse pistol.

"Come outside and close the door behind you. I know you haven't on many clothes, but the night's warm, and you need fresh air."

The man with the muzzle of the pistol still near his nose, obeyed. But as he looked at the weapon he also had a comprehensive view of the one who held it.

"Wet ain't you?" he said.

"Do you think it necessary to put it in the form of a question?"

"I don't like to say, unless I'm shore."

"Where do you keep your horses?"

"In the barn here to the left. What kind of a horse did you think you'd keer fur most, stranger?"

"The biggest, the strongest and fastest you've got"

"I thought mebbe you'd want one with wings, you 'pear to be in such a pow'ful hurry. I wish you wouldn't keep that pistol so near to my nose. 'Sides, you've gethered so much mud an' water 'bout you that you ain't so very purty to look at!"