HE was a young man, not more than twenty-four or five, and he might have sat his horse with the careless grace of his youth had he not been so catlike and tense. His black eyes roved everywhere, catching the movements of twigs and branches where small birds hopped, questing ever onward through the changing vistas of trees and brush, and returning always to the clumps of undergrowth on either side. And as he watched, so did he listen, though he rode on in silence, save for the boom of heavy guns from far to the west. This had been sounding monotonously in his ears for hours, and only its cessation could have aroused his notice. For he had business closer to hand. Across his saddle-bow was balanced a carbine. So tensely was he strung, that a bunch of quail, exploding into flight from under his horse's nose, startled him to such an extent that automatically, instantly, he had reined in and fetched the carbine halfway to his shoulder. He grinned sheepishly, recovered himself, and rode on. So tense was he, so bent upon the work he had to do, that the sweat stung his eyes unwiped, and unheeded rolled down his nose and spattered his saddle pommel. The band of his cavalryman's hat was fresh-stained with sweat. The roan horse under him was likewise wet. It was high noon of a breathless day of heat. Even the birds and squirrels did not dare the sun, but sheltered in shady hiding places among the trees. Man and horse were littered with leaves and dusted with yellow pollen, for the open was ventured no more than was compulsory. They kept to the brush and trees, and invariably the man halted and peered out before crossing a dry glade or naked stretch of upland pasturage. He worked always to the north, though his way was devious, and it was from the north that he seemed most to apprehend that for which he was looking. He was no coward, but his courage was only that of the average civilized man, and he was looking to live, not die. Up a small hillside he followed a cowpath through such dense scrub that he was forced to dismount and lead his horse. But when the path swung around to the west, he abandoned it and headed to the north again along the oak-covered top of the ridge. The ridge ended in a steep descent-so steep that he zigzagged back and forth across the face of the slope, sliding and stumbling among the dead leaves and matted vines and keeping a watchful eye on the horse above that threatened to fall down upon him. The sweat ran from him, and the pollen-dust, settling pungently in mouth and nostrils, increased his thirst. Try as he would, nevertheless the descent was noisy, and frequently he stopped, panting in the dry heat and listening for any warning from beneath.