"You are my prisoner, Zat Arras," I cried. "Yield and you shall have quarter."

For a moment I could not tell whether he contemplated acceding to my demand or facing me with drawn sword. For an instant he stood hesitating, and then throwing down his arms he turned and rushed to the opposite side of the deck. Before I could overtake him he had sprung to the rail and hurled himself headforemost into the awful depths below.

And thus came Zat Arras, Jed of Zodanga, to his end.

On and on went that strange battle. The therns and blacks had not combined against us. Wherever thern ship met ship of the First Born was a battle royal, and in this I thought I saw our salvation. Wherever messages could be passed between us that could not be intercepted by our enemies I passed the word that all our vessels were to withdraw from the fight as rapidly as possible, taking a position to the west and south of the combatants. I also sent an air scout to the fighting green men in the gardens below to re-embark, and to the transports to join us.

My commanders were further instructed than when engaged with an enemy to draw him as rapidly as possible toward a ship of his hereditary foeman, and by careful manoeuvring to force the two to engage, thus leaving him-self free to withdraw. This stratagem worked to perfection, and just before the sun went down I had the satisfaction of seeing all that was left of my once mighty fleet gathered nearly twenty miles southwest of the still terrific battle between the blacks and whites.

I now transferred Xodar to another battleship and sent him with all the transports and five thousand battleships directly overhead to the Temple of Issus. Carthoris and I, with Kantos Kan, took the remaining ships and headed for the entrance to Omean.

Our plan now was to attempt to make a combined assault upon Issus at dawn of the following day. Tars Tarkas with his green warriors and Hor Vastus with the red men, guided by Xodar, were to land within the garden of Issus or the surrounding plains; while Carthoris, Kantos Kan, and I were to lead our smaller force from the sea of Omean through the pits beneath the temple, which Carthoris knew so well.

I now learned for the first time the cause of my ten ships' retreat from the mouth of the shaft. It seemed that when they had come upon the shaft the navy of the First Born were already issuing from its mouth. Fully twenty vessels had emerged, and though they gave battle immediately in an effort to stem the tide that rolled from the black pit, the odds against them were too great and they were forced to flee.

With great caution we approached the shaft, under cover of darkness. At a distance of several miles I caused the fleet to be halted, and from there Carthoris went ahead alone upon a one-man flier to reconnoitre. In perhaps half an hour he returned to report that there was no sign of a patrol boat or of the enemy in any form, and so we moved swiftly and noiselessly forward once more toward Omean.

At the mouth of the shaft we stopped again for a moment for all the vessels to reach their previously appointed stations, then with the flagship I dropped quickly into the black depths, while one by one the other vessels followed me in quick succession.

We had decided to stake all on the chance that we would be able to reach the temple by the subterranean way and so we left no guard of vessels at the shaft's mouth. Nor would it have profited us any to have done so, for we did not have sufficient force all told to have withstood the vast navy of the First Born had they returned to engage us.

For the safety of our entrance upon Omean we depended largely upon the very boldness of it, believing that it would be some little time before the First Born on guard there would realize that it was an enemy and not their own returning fleet that was entering the vault of the buried sea.

And such proved to be the case. In fact, four hundred of my fleet of five hundred rested safely upon the bosom of Omean before the first shot was fired. The battle was short and hot, but there could have been but one outcome, for the First Born in the carelessness of fancied security had left but a handful of ancient and obsolete hulks to guard their mighty harbour.

It was at Carthoris' suggestion that we landed our prisoners under guard upon a couple of the larger islands, and then towed the ships of the First Born to the shaft, where we managed to wedge a number of them securely in the interior of the great well. Then we turned on the buoyance rays in the balance of them and let them rise by themselves to further block the passage to Omean as they came into contact with the vessels already lodged there.

We now felt that it would be some time at least before the returning First Born could reach the surface of Omean, and that we would have ample opportunity to make for the subterranean passages which lead to Issus. One of the first steps I took was to hasten personally with a good-sized force to the island of the submarine, which I took without resistance on the part of the small guard there.

I found the submarine in its pool, and at once placed a strong guard upon it and the island, where I remained to wait the coming of Carthoris and the others.

Among the prisoners was Yersted, commander of the submarine. He recognized me from the three trips that I had taken with him during my captivity among the First Born.

"How does it seem," I asked him, "to have the tables turned? To be prisoner of your erstwhile captive?"

He smiled, a very grim smile pregnant with hidden meaning.

"It will not be for long, John Carter," he replied. "We have been expecting you and we are prepared."

"So it would appear," I answered, "for you were all ready to become my prisoners with scarce a blow struck on either side."

"The fleet must have missed you," he said, "but it will return to Omean, and then that will be a very different matter-for John Carter."

"I do not know that the fleet has missed me as yet," I said, but of course he did not grasp my meaning, and only looked puzzled.

"Many prisoners travel to Issus in your grim craft, Yersted?" I asked.

"Very many," he assented.

"Might you remember one whom men called Dejah Thoris?"

"Well, indeed, for her great beauty, and then, too, for the fact that she was wife to the first mortal that ever escaped from Issus through all the countless ages of her godhood. And the way that Issus remembers her best as the wife of one and the mother of another who raised their hands against the Goddess of Life Eternal."

I shuddered for fear of the cowardly revenge that I knew Issus might have taken upon the innocent Dejah Thoris for the sacrilege of her son and her husband.

"And where is Dejah Thoris now?" I asked, knowing that he would say the words I most dreaded, but yet I loved her so that I could not refrain from hearing even the worst about her fate so that it fell from the lips of one who had seen her but recently. It was to me as though it brought her closer to me.

"Yesterday the monthly rites of Issus were held," replied Yersted, "and I saw her then sitting in her accustomed place at the foot of Issus."

"What," I cried, "she is not dead, then?"

"Why, no," replied the black, "it has been no year since she gazed upon the divine glory of the radiant face of-"

"No year?" I interrupted.

"Why, no," insisted Yersted. "It cannot have been upward of three hundred and seventy or eighty days."

A great light burst upon me. How stupid I had been! I could scarcely retain an outward exhibition of my great joy. Why had I forgotten the great difference in the length of Martian and Earthly years! The ten Earth years I had spent upon Barsoom had encompassed but five years and ninety-six days of Martian time, whose days are forty-one minutes longer than ours, and whose years number six hundred and eighty-seven days.