The plan of operation was laid out with as much care and attention to details as a general would employ in planning a battle. The Pony Rider Boys were to participate in the chase. They could scarcely wait for the moment to arrive when they would be given an opportunity to show their horsemanship.

In the camp in the mountains they were told with great detail just what they were expected to do.

"I think you had better leave Chunky at home," warned Ned. "He'll stampede the whole bunch just as you are ready to drive them into the corral."

Chunky protested loudly.

"Guess I can stick on a pony as well as you can," he retorted.

"I'll vouch for that," smiled Tom Parry.

"He'll do," decided Bud. "Now, you fellows are all to string out in single file, following me until we have circled the herd. We should have them pretty well surrounded by noon. At that time they'll be at the spring filling up. When I'm ready to close in, I'll fire a shot. Each of you will fire in turn so that every one in line may be notified. If the critters refuse to drive, then we'll have to whip them into a circle and tire them out. But first, we must get them out on the open, no matter which way they go, then work them into the draw as fast as we can."

The horse-hunters nodded. They understood perfectly what they were expected to do. And the boys were to be scattered among the men at intervals instead of traveling together. It seemed very simple to them, but they were to learn that wild-horse hunting was a man's task.

"Are we allowed to rope if we get the chance?" questioned Tad.

"Not during the run. Of course, if you see an animal escaping after we have rounded them up, and you can do so without losing any of the others, rope if you want to. I reckon you'll have your hands full if you try it," concluded the horse-hunter.