He thought that by trekking westward he would soon get beyond the ground they had laid bare.
He knew something of the plains to the west--not much indeed, but he knew that at about forty miles distance there was a spring with good pasturage around it, upon whose water he could depend.

He had once visited it, while on a search for some of his cattle, that had wandered thus far.

Indeed, it then appeared to him a better situation for cattle than the one he held, and he had often thought of moving to it.

Its great distance from any civilised settlement was the reason why he had not done so.

Although he was already far beyond the frontier, he still kept up a sort of communication with the settlements, whereas at the more distant point such a communication would be extremely difficult.
Now that other considerations weighed with him, his thoughts once more returned to this spring; and after spending a few minutes more in earnest deliberation, he decided upon "trekking" westward.
Swartboy was ordered to head round, and strike to the west.