"They're off!" yelled a cowman.

"Head them!"

"Can't. They're started in the center of the herd."

With heads down, the entire herd was now charging straight ahead. Big-foot Sanders and Tad Butler, nearly half a mile ahead, felt the impetus, too.

"Keep your head, boy," warned the cowpuncher. "We are in for a run for our money, now."

It came even as he spoke. With a bellow the cattle started forward at a lively gallop.

"Whoa-oo-ope!" cried Big-foot, riding in front of the plunging leaders.

He might as well have sought to stay the progress of the wind. The leaders swept man and boy aside and dashed on.

"Better keep them straight and not try to stop them, hadn't we?" shouted Tad, with rare generalship.

"That's the trick! Can you hold your side?" roared Big-foot in reply.