In answer the cowboy pointed across the river. The cloud of dust had settled, revealing more plainly now thousands of sheep. And as the defenders of the fort watched they saw, separating from the sheep, a number of men who approached the Mexican bank of the stream.

What were they going to do?

CHAPTER XVI

STRANGE ACTIONS

Until there was what in law is termed an "overt act," the boy ranchers and their friends could do nothing against the sheep herders who were there in plain sight, with their woolly charges on the far side of Spur Creek. "Overt act" is a law term, and practically means an open act as distinguished from one that is done in secret and under cover.

Thus if the sheep herders should openly attempt to cross the creek, and drive their animals up on Mr. Merkel's land—or land which he claimed—then Bud and his associates could proceed against them, driving them off—"repelling boarders," as Dick expressed it, having in mind some of his favorite pirate tales.

But until the sheep men had done something—had committed an overt act—they could not be molested as long as they remained where they were.

"It's like this," explained Bud, for his father had made matters plain to him over the mended telephone line. "We got to wait until they set foot on our land—or until some of their onery sheep begin to nibble—and then we can start something."

"What, for instance?" asked Dick.