He stepped forward into the open doorway, and blew three shrill blasts on a silver whistle. The echo had scarcely died away, when, out from a thick clump of trees perhaps half a mile distant, a horse shot forth, racing toward us. As the reckless rider drew up suddenly, I saw him to be a barefooted, freckle-faced boy of perhaps sixteen, his eyes bright with excitement. "So it's you on duty, Ben," said Farrell quietly, glancing from the boy to his horse. "Well, you're in for a ride. Have the men at Lone Tree by sundown; all of them. See Duval first, an' tell him for me this is a big thing. Now off with you!" The boy, grinning happily, swung his horse around, and, jabbing his sides with bare heels, rode madly away directly south across the vacant land. Within five minutes he had vanished down a sharp incline. Farrell was still staring after him, when I asked: "What is it?" "A little bit of private war," he said grimly. "If you'll go with me to-night, Major, I'll show you some guerilla fighting. You heard what Grant said about Delavan. We've been waiting five days for him to head back toward Philadelphia. He has twenty wagons, an' a foraging party of less than fifty men somewhere out Medford way," with sweep of hand to the northeast. "If he an' Grant get together the two commands will outnumber us, but we'll have the advantage of surprise, of a swift attack in the dark. In my judgment that is what Grant was sent out for--to guard Delavan's wagons. His spy hunting was a personal affair. My advice to you, Lawrence, is to lie quiet here to-day, and go along with us to-night. It will be in the same direction you'll have to travel, an' you might have trouble by daylight. No objections to a fight, have you?" "None whatever." "I judged so from your face. Better get what rest you can; we shall have twenty miles to ride before dark. I'll go over into the timber there an' feed the horses."