The Zulus reached the spot and plunged into the cover, from which there instantly arose a tremendous hubbub, and a moment later all three reappeared, fairly driven out by half a score of white men, and fighting furiously with their spears against several of the slavers, who were armed with axes, whilst the remainder stood by eagerly seeking an opportunity to use their guns.

Promptly Leigh and Kenyon pitched forward their rifles, and two of the slavers instantly rolled head over heels down the mountain side, whilst at the same moment, uttering a wild shout of encouragement, Amaxosa dashed forward like an arrow from the bow, and in another second was side by side with his warriors, their nervous arms dealing out death and disaster with every sweeping blow. When Leigh and Kenyon reached the platform upon which this tragedy had been enacted, there was but one of the enemy left alive, and he was engaged in a terrific hand-to-hand combat with Amaxosa. All at once the Zulu’s axe broke off short in the haft, and the ruffian slaver rushed at him with a victorious shout. Springing lightly to one side, however, the active chief easily avoided the deadly stroke aimed at him by his opponent, whom he seized the next instant from behind, with his powerful hands pinning the man’s arms to his side, and before anyone could interfere, or even speak, with one mighty effort the fierce Zulu fairly swung his hapless foe from the ground, and then dashed him down full upon the rock, on his bare skull, which was crushed in like an egg-shell, the awful blow, of course, killing him on the spot, and an instant later the mountain side echoed to the triumphant notes of the famous Undi war-chant.

“Oh, my father,” said the great Zulu, contemplating his handiwork with satisfaction, and speaking to Leigh, “it was a great fight; few could have slain the man with empty hands. Sleep softly, ye evildoers; the Lion of the Undi bids you sleep!”

Carefully examining the cover from which the discomfited foe had sprung, our friends found that it consisted of a shallow cave in the face of the rock, the entrance being masked by low bushes, and a thick undergrowth of wild vines. In this hiding-place Kenyon discovered a basket containing three white and two black pigeons, whilst a note, evidently the one just received, lay upon the rocky floor. Eagerly pouncing upon this, the detective quickly mastered its contents, which were simply as follows:—

“The second detachment will arrive at midnight to-night.—

“Zero.”

Clearly it was not, therefore, a mere question of spying upon their position; but the evident intention of the cunning slaver was to send in small drafts of men to conceal themselves upon the mountain; and these, when his own army moved up to the attack, would, at a given signal, doubtless fall upon our friends in the rear, and thus effect a very serious diversion in favour of Zero, at a most critical moment.

The scheme was well thought-out, but the watchfulness of Kenyon had completely ruined it; and if the further suggestions which he now made should prove workable, the little band might be relied upon to read Master Zero another very severe and humiliating lesson, when he made his intended final onset.

Briefly, Kenyon’s idea consisted of an attempt to lure the second detachment of slavers on to their utter destruction, but in view of their prematurely taking the alarm in consequence of our friends possibly failing to understand and correctly to answer their secret signals, a large party was to be slipped into the long grass of the veldt to intercept the slavers in the event of their making a push to escape, and an endeavour was to be made to capture some of the men alive, and force them to give up the secrets of their curious system of aerial correspondence.

Finally it was decided that Amaxosa should set out with ten of his own men and fifty of the warriors of the Atagbondo at moonrise, and lie in ambush about three miles to the north of the mountain, but this party was on no account to make any movement, except in the event of a rocket being fired from the camp, giving them the direction of the escaping slavers. The Zulu was especially cautioned against making fire signals of any kind, as it was calculated that the enemy would, themselves, probably employ these.