"'Cause he was expectin' somethin' that would stop him," said the Panther angrily. "I hate liars an' traitors. Well, we'll soon see."

Their curiosity became so great that they rode at a swift trot on the great south trail, and not ten miles further they came upon the unmistakable evidences of another big camp that had lasted long.

"Slower an' slower," muttered the Panther. "They must have met a messenger. Wa'al, it's fur us to go slow now, too."

But he said aloud:

"Boys, it ain't more'n twenty miles now to the Rio Grande, an' we can hit it by dark. But I'm thinkin' that we'd better be mighty keerful now as we go on."

"I suppose it's because Mexican scouts and skirmishers may be watching," said Ned.

"Yes, an' 'specially that fellow Urrea. His uncle bein' one of Santa Anna's leadin' gen'rals, he's likely to have freer rein, an', as we know, he's clever an' active. I'd hate to fall into his hands again."

They rode more slowly, and three pairs of eyes continually searched the plain for an enemy. Ned's sight was uncommonly acute, and Obed and the Panther frequently appealed to him as a last resort. It flattered his pride and he strove to justify it.

Their pace became slower and slower, and presently the early twilight of winter was coming. A cold wind moaned, but the desolate plain was broken here and there by clumps of trees. At the suggestion of the Panther

they rode to one of these and halted under cover of the timber.