Two more days passed; the Arabs burst out now and then into a spurt of volley firing, but would not attempt another attack. They probably knew the nature of the wells, and trusted to thirst to fight for them. The little party in the zereba kept a sharp look-out for rescue, you may depend, for their position was growing more and more critical every hour. To the south was the spring, with a few trees, and the thick mimosa bush beyond. On the east were more mimosas and rocky ground in which the enemy could find cover to within five hundred yards at the furthest part; up to two hundred at one point. But on the northern and western sides the country was quite open, and the view was only bounded by sand-hills a good mile off. And it was from one of these directions that they expected help would come. So when dust was noticed, amidst which an occasional glitter flashed, on the western horizon, eyes began to sparkle and hearts to beat high, as those of shipwrecked men in an open boat when a sail comes in sight. No doubt it was a party sent to relieve them--cavalry, by the pace they came, for the cloud of dust rolled rapidly nearer. In five minutes it was within a thousand yards, and then out of it burst a single horseman, riding straight for the zereba, and the enemy, running from their cover on the southern side, strove to intercept him with their fire as he passed, while presently some twenty Arab horsemen became visible, racing after the fugitive, the foremost about twenty yards from his heels. _Bang_! _bang_! _bang_! From the Arabs, who had run out, and were somewhat too far for the zereba fire. But the hunted man came on untouched. It is not easy, even for good shots, to hit flying with ball, and the Arabs were not good shots, but the exact reverse. Nearer now, with his horse well in hand, not seeking to increase his distance, glancing back to judge how far off his pursuers were. The footmen of the enemy, provoked at not being able to stop him, ran out in his course too close to the English, and two of them were presently down on the sand. Others not heeding sought to cut him off, and the English could not fire without risk to him also, as they were straight in his direction. Whipping out his sword, which had hitherto been sheathed, he flourished it in salutation of his friends, and rode straight at a couple of Arabs in his path, loosening his rein, and digging with his spurs as he did so. He knocked one down with his horse's shoulder, and put aside the spear of the other, as he passed, and without waiting to cut at him, went straight at the zereba hedge. The horse, though covered with foam, had a good bit left in him yet, and rose at it nobly, without an attempt to refuse, and landed safely on the inside. His pursuers came within ten yards. There was a spurt of fire, and four saddles were empty.