Meanwhile, the dawn is broadening; the grayish pallor at the orient takes on a warmer tint, and a feeble glow of orange and crimson steals up the heavens. The slopes and swales around the lonely outpost grow more and more visible, the distant ridge more sharply defined against the southern sky. Off to the left, the eastward, the river rolls along in a silvery, misty gleam; and their comrades, still sheltered under the bluff, are beginning to gather around the horses and look to the bridles and "cinchas." Now the red blush deepens and extends along the low hill-tops across the Platte, and tinges the rolling prairie to the south and west. A few minutes more and the glow is strong enough to reveal an old but well-defined trail leading from the distant ridge straight up to the little crest where McLean is lying. It seems to follow a south-westerly course, and is the trail, beyond doubt, along which the marauders from the reservations have time and again recrossed with their plunder and gained the official shelter of those sacred limits. "Why, sir," says Corporal Connor, who is lying there beside the young officer, "last October a party came over and scalped two women and three teamsters not three miles from the post, and ran off with all their cattle. We caught up with them just across the Niobrara, and they dropped the mules and horses they were driving and made a run for it. We chased and gained on them every inch of the way, but they got to the lines first, and then they just whirled about and jeered at us and shook the scalps in our faces, and called us every name you could think of,--in good English, too," added the trooper seriously; "and the lieutenant and I rode to the agency and pointed out two of them to the agent that very day, but he didn't dare arrest them. His life depended on his standing by them through thick and thin. Look, lieutenant! Look off there!" Over to the southwest, dimly visible, three or four shadowy objects are darting rapidly over the distant ridge that spans the horizon in that direction. For one moment only they are revealed against the sky, then can be seen, faint as far-away cloud-shadows, sweeping down into the shallow valley and making for the river above the position of the outpost. Indians, beyond question! the advance guard of the main body; and the time for action has come.