As soon as their boat was out of sight, the hatches were raised, the crew poured up out of the hold, and in a short time the Boxer's deck presented its usual appearance of neatness and order. Frank's object had been accomplished, for the market men had gone away satisfied that twenty determined men could easily effect the capture of the gun-boat, and they seemed determined to make the most of what they had seen. Gaines's Landing had been a regular mail station, and the rebels had only been deterred from sending it across the river by the presence of the Boxer. The market men, however, had discovered, as they supposed, that the vessel was but poorly manned, and this being communicated to their leader, (for, as Frank had suspected, they belonged to a regularly-organized band of guerrillas,) the latter determined to dispatch his mail at once. That night, about ten o'clock, as Frank and Archie sat in the cabin reading, the orderly reported that lights were seen moving about on shore. This was something unusual, and when Frank had watched the light for a moment, he came to the conclusion that the rebels were making some movements, the nature of which he was, of course, unable to determine; but he resolved, if possible, to find out what was going on, and turning to the officer of the deck, ordered the cutter to be called away and furnished with an armed crew. This order was speedily and quietly executed, and when the boat was ready, Frank and his cousin stepped into it, and were pulled noiselessly up the river. The place where the light shone was about half a mile from the vessel, and when they came opposite to it, the crew rested on their oars, giving only an occasional stroke to keep the cutter from floating down the stream, and waited impatiently for the rebels to show themselves. The light, which gleamed from the shore opposite to the town, seemed to come from a dark lantern, for it would blaze up brightly for a moment, and then disappear. Presently an answering light was shown from the shore nearest to them, when Archie whispered-- "There's a boat coming!" Frank listened, and could hear the slow, measured strokes of oars, which grew louder and louder as the boat approached. It seemed to be heading directly toward them, and in a few moments more it could be dimly seen, moving through the darkness.