"Sit down, Mr. Kenton," he said kindly. "I've already been speaking to Captain Sherburne and I'll tell you now what I want. General McClellan's army is still beyond the Potomac. As nearly as our spies can estimate it has, present and fit for duty, one hundred and thirty-five thousand men and three hundred and fifty cannon. McClellan, as we well know, is always overcautious and overestimates our numbers, but public opinion in the North will force him to action. They claim there that Antietam was a victory for them, and he will surely invade Virginia again. I shall send Captain Sherburne and his troop to find out where and when, and you are to go with him as my aide and personal representative." "Thanks, sir," said Harry. "When can you start?" "Within five minutes." "Good. I was going to allow you ten, but it's better to take only five. Captain Sherburne, you have your instructions already. Now go, and bear in mind, both of you, that you are to bring back what you are sent to get, no matter what the cost. Prepare no excuses." There was a stern and ominous ring in his last words, and Harry and Sherburne, saluting, retired with all speed. Harry ran to his own tent, snatched up his arms and blanket-roll, saddled and bridled his horse, and well within five minutes was riding by the side of Captain Sherburne. He shouted to St. Clair, who had run forward in amazement: "Gone on a mission for Old Jack. Will be back--some time." The cavalry troop of two hundred splendid men, led by Sherburne, one of the finest of the younger leaders, trotted fast through the oak forest. They were fully refreshed and they were glad of action. The great heats of that famous summer, unusually hot alike in both east and west, were gone, and now the cool, crisp breezes of autumn blew in their faces. "Have you heard at what point on the Potomac the Union army is gathered?" Harry asked. "At a village called Berlin, so our spies say. You know McClellan really has some high qualities. We found a heavy reconnoitering force of cavalry not far in our front two or three days ago, and we did not know what it meant, but General Jackson now has an idea that McClellan wanted to find out whether we were near enough to the Potomac to dispute his passage." "We are not." "No, we're not, and I don't suppose General Lee and General Jackson wish to keep him on the other side. But, at any rate, we're sent to find out whether he is crossing." "And we'll see." "We surely will." CHAPTER II AHORSE WITH SHERBURNE Harry was glad that General Jackson had detailed him for this task. He missed his comrades of the staff, but Sherburne was a host in himself, and he was greatly attached to him. He rode a good horse and there was pleasure in galloping with these men over the rolling country, and breathing the crisp and vital air of autumn.