"But who built up the rock piles to make these signs?" asked Franklin.
"O Lord! now you've got me," said Curly. "I don't know no more about that than you do. Injuns done it, maybe. Some says the first wild-horse hunters put 'em up. They was always there, all over the dry country, far back as ever I heard. You ask Juan if there ain't water not far off. See what he says.—Oye, Juan! Tengo agua, poco tiempo?"
The giant did not even lift his head, but answered listlessly, "Agua? Si," as though that were a matter of which all present must have equal knowledge.
"That settles it," said Curly. "I never did know Juan to miss it on locatin' water yet, not onct. I kin fairly taste it now. But you see, Juan, he don't seem to go by no rock-pile signs. He just seems to smell water, like a horse or a steer."
They now rode on more rapidly, bearing off toward the cairn which made the water sign. All at once Juan lifted his head, listened for a moment, and then said, with more show of animation than he had yet displayed and with positiveness in his voice: "Vacas!" ("cows; cattle").
Curly straightened up in his saddle as though electrified. "Vacas? Onde, Juan?—where's any cows?" He knew well enough that no hoof of domestic cattle had ever trod this country. Yet trust as he did the dictum of the giant's strange extra sense, he could not see, anywhere upon the wide country round about them, any signs of the buffalo to which he was sure the Mexican meant to call his attention.
"Vacas! muchas," repeated Juan carelessly.
"Lots of 'em, eh? Well, I'd like to know where they are, my lily of the valley," said Curly, for once almost incredulous. And then he stopped and listened.—"Hold on, boys, listen," he said. "Look out—look out! Here they come!"
Every ear caught the faint distant pattering, which grew into a rapid and insistent rumble. "Cavalry, b'gad!" cried Battersleigh. Franklin's eyes shone. He spurred forward fast as he could go, jerking loose the thong which held his rifle fast in the scabbard under his leg.
The tumultuous roaring rumble came on steadily, the more apparent by a widening and climbing cloud of dust, which betokened that a body of large animals was coming up through the "breaks" from the bed of the stream to the prairie on which the wagons stood. Presently there appeared at the brink, looming through the white dust cloud, a mingling mass of tangled, surging brown, a surface of tossing, hairy backs, spotted with darker fronts, over all and around all the pounding and clacking of many hoofs. It was the stampede of the buffalo which had been disturbed at their watering place below, and which had headed up to the level that they might the better make their escape in flight. Head into the wind, as the buffalo alone of wild animals runs, the herd paid no heed to the danger which they sought to escape, but upon which they were now coming in full front. The horses of the hunters, terrified at this horrid apparition of waving horned heads and shaggy manes, plunged and snorted in terror, seeing which the first rank of the buffalo in turn fell smitten of panic, and braced back to avoid the evil at their front. Overturned by the crush behind them, these none the less served to turn the course of the remainder of the herd, which now broke away to the right, paralleling the course of the stream and leaving the wagons of the hunters behind them and at their left. The herd carried now upon its flank three figures which clung alongside and poured sharp blue jets of smoke into the swirling cloud of ashy dust.