"What is it, Antonio?" Will exclaimed, for it was evident from the man's appearance that his errand was one of extreme importance.

"The hacienda has been attacked by Indians, señor; I was with the herd two miles this side of it when I heard some shots fired. I galloped to see what was the matter, but when I got within a quarter of a mile I saw that the Indians were swarming round it. A dozen started in pursuit of me, but they did not follow me far."

Will stood as one thunderstruck.

"But how can they have got there, Antonio?"

"They must have come by what is called the little gap. You know it, señor,—that valley that runs off from the other nearly abreast of the hacienda. Following that and crossing a shoulder, you cross down on to the river some ten miles higher up. They must have crossed there by swimming in the night."

"But the chief said he had scouts there."

"They could hardly watch thirty miles of the river, señor; besides, the red-skins would have sent over two or three swimmers to silence anyone they found near the place where they were to cross."

By this time a dozen other vaqueros, who had been warned by Antonio as he came down, joined them.

"We must ride for the hacienda at once," Will said, leaping into the saddle.

"No use, señor, no use. I should say there must be four hundred or five hundred of the red-skins, and we may be sure that there is not a soul alive now at the hacienda or at the huts. They will be here in a short time, of that there is no doubt; probably half will come down the valley and half will go up. We must ride for it, sir; follow the river down till we are past the hills; there is not a moment to be lost."