It was perhaps half an hour later that the two troops, separated till then by quite a wide stretch of desert, and hidden entirely from one another and from the enemy by that long, low eminence, converged upon one another and rode out into the open. A careful advance near the bank of the river, where the palms hid them, and the fact that the attention of the Arab horsemen was fixed for the most part on the signallers and their officer left on the eminence, had allowed one troop to get within striking distance of the enemy. Then they suddenly debouched from the trees, and, trotting out into the desert, formed up for a charge; almost at the same moment a cloud of dust far away in the open showed them the position of the second troop, which, riding faster, had got almost beyond the position held by the Arabs. In fact, a rapid movement might enclose the enemy between the two troops, and in any case this menace from two points at once threw them into confusion; shouts were heard from the Arabs, while at once loud reports burst from their ranks, all manner of weapons being discharged at the Indian horsemen. To these was added the sharp, clear-cut snap of modern rifles, with which the Turkish infantry were armed. Then a trumpet blared in the distance, and that cloud of dust suddenly grew bigger, grew bigger and wider, and stretched out till it covered quite a large area. The troop close down by the river, which had just emerged from the trees, cantered out now till six feet of space separated the horsemen. Then the pennons at the tips of the lances waved, a sharp order snapped down the ranks, and in a trice the lances were lowered. That trumpet blaring in the distance had set every horse in this other troop curveting and prancing, and now, as a note came from their own trumpeter, the horses were off, the men leaning low down in their saddles, their eyes glued on the enemy, their knees gripping their horses, and their lances pointed well out before them. What a shout those Indian sowars gave! Their comrades coming from the opposite direction answered with a shrill yell of triumph, and then, like a flash, the two troops were launched against the enemy. Converging as they came, till there were perhaps only some four or five hundred yards between the flanks of each of the troops, the horsemen plunged into the midst of the Arabs. Here and there they had left a horse rolling on the sand behind them, and there was more than one animal without a rider as they got close to the enemy; but nothing stopped the Indians, neither the shouts nor the bullets of the Arabs. With a crash they were in at them, thrusting right and left, riding them down, riding over them, and then it was over. What was left of those Arab horsemen scattered and fled in every direction, leaving the Indian Horse conquerors. [Illustration: "WHAT WAS LEFT OF THOSE ARAB HORSEMEN SCATTERED AND FLED"] As for Geoff, his fingers trembled as he pulled Sultan in and dropped from his saddle.