The Turk was much pleased with the idea, and nodded his head repeatedly, holding out his hand for the ring. Rob had little confidence in the man's honor, but he was so eager to regain the tube that he decided to trust him. So he threw the ring to the top of the wall, where the Turk caught it skilfully; but when Rob held out his hand for the tube the scoundrel only laughed at him and began to scramble to his feet in order to beat a retreat. Chance, however, foiled this disgraceful treachery, for in his hurry the Turk allowed the tube to slip from his grasp, and it rolled off the wall and fell upon the sand at Rob's very feet.

The robber turned to watch its fall and, filled with sudden anger, the boy grabbed the weapon, pointed it at his enemy, and pressed the button. Down tumbled the Turk, without a cry, and lay motionless at the foot of the wall.

Rob's first thought was to search the pockets of his captive, and to his delight he found and recovered his box of food tablets. The Record of Events and the traveling machine were doubtless in the possession of the other robbers, but Rob did not despair of recovering them, now that he had the tube to aid him.

Day was now breaking, and several of the Tatars appeared and examined the body of the Turk with grunts of surprise, for there was no mark upon him to show how he had been slain. Supposing him to be dead, they tossed him aside and forgot all about him.

Rob had secured his ruby ring again, and going to the chief's tent he showed the jewel to the guard and was at once admitted. The black-bearded chieftain was still reclining upon his pillows, but Rob bowed before him, and by means of signs managed to ask for a band of warriors to assist him in assaulting the town. The chieftain appeared to doubt the wisdom of the enterprise, not being able to understand how the boy could expect to succeed; but he graciously issued the required order, and by the time Rob reached the city gate he found a large group of Tatars gathered to support him, while the entire camp, roused to interest in the proceedings, stood looking on.

Rob cared little for the quarrel between the Turks and Tatars, and under ordinary circumstances would have refused to side with one or the other; but he knew he could not hope to recover his electrical machines unless the city was taken by the band of warriors who had befriended him, so he determined to force an entrance for them.

Without hesitation he walked close to the great gate and shattered its fastenings with the force of the electric current directed upon them from the tube. Then, shouting to his friends the Tatars for assistance, they rushed in a body upon the gate and dashed it open.

The Turks had expected trouble when they heard the fastenings of the huge gate splinter and fall apart, so they had assembled in force before the opening. As the Tatars poured through the gateway in a compact mass they were met by a hail of bullets, spears and arrows, which did fearful execution among them. Many were killed outright, while others fell wounded to be trampled upon by those who pressed on from the rear.

Rob maintained his position in the front rank, but escaped all injury through the possession of the Garment of Repulsion. But he took an active part in the fight and pressed the button of the electric tube again and again, tumbling the enemy into heaps on every side, even the horses and camels falling helplessly before the resistless current of electricity.

The Tatars shouted joyfully as they witnessed this marvelous feat and rushed forward to assist in the slaughter; but the boy motioned them all back. He did not wish any more bloodshed than was necessary, and knew that the heaps of unconscious Turks around him would soon recover.