It was a singular and weird sound, the blowing of the great cow's horn on the mountain, and then the distant reply from another horn as great. It was both significant and sinister, such an extraordinary note that, despite Dick's experience and courage, his hair lifted a little. He was compelled to look back at the camp and the coals of the fire yet glowing to reassure himself that everything was normal and real. "I wish there wasn't so much snow," said Shepard, "then the sergeant, Mr. Reed and myself could scout all over the country around here, mountains or no mountains." They were joined at that moment by Reed, the long mountaineer, who had also been listening to the big horns. "That means them gorillers, shore," he said. "We've got some p'ison people uv our own, an' when the gorillers come in here they j'ined 'em, and knowin' ev'ry inch uv the country, they kin guide the gorillers wharever they please." "You agree then with Mr. Shepard that these signals are made by Slade and Skelly's men?" asked Dick. "Shorely," replied the mountaineer, "an' I think they're up to some sort uv trick. It pesters me too, 'cause I can't guess it nohow. I done told the colonel that we'd better look out." Colonel Winchester joined them as he was speaking, and listened to the double signal which was repeated later. But it did not come again, although they waited some time. Instead they heard, as they had heard all through the night, the occasional swish of the soft snow sliding down the slopes. But Dick saw that the colonel was uneasy, and that his apprehensions were shared both by Shepard and the mountaineer. "Do you know how many men these brigands have?" Colonel Winchester asked of Reed. "I reckon thar are five hundred uv them gorillers," replied the mountaineer. "Some uv our people spied on 'em in Burton's Cove an' counted 'bout that number." Colonel Winchester glanced at his sleeping camp. "I have three hundred," he said, "but they're the very flower of our youth. In the open they could take care of a thousand guerrillas and have something to spare. Still in here--" He stopped short, but the shrewd mountaineer read his meaning. "In the mountings it ain't sech plain sailin'," he said, "an' you've got to watch fur tricks. I reckon that when it comes to fightin' here, it's somethin' like the old Injun days." "I can't see how they can get at us here," said Colonel Winchester, more to himself than to the others. "A dozen men could hold the exit by the creek, and fifty could hold the entrance." Despite his words, his uneasiness continued and he sent for the sergeant, upon whose knowledge and instincts he relied greatly in such a situation. The sergeant, who had been watching at the other end of the valley, came quickly and, when the colonel looked at him with eyes of inquiry, he said promptly: