内容简介：
You have the keenest eyes in the troop. Can you see anything ahead? asked Colonel Winchester. "Nothing living, sir," replied Dick Mason, as he swept his powerful glasses in a half-curve. "There are hills on the right and in the center, covered with thick, green forest, and on the left, where the land lies low, the forest is thick and green too, although I think I catch a flash of water in it." "That should be the little river of which our map tells. And you, Warner, what do your eyes tell you?" "The same tale they tell to Dick, sir. It looks to me like a wilderness."