"Jat Or, you and Gar Nal follow immediately behind Ur Jan and me." And then, in his own language, I told Umka to board the ship immediately after Jat Or and Gar Nal. "And if the fighting is not all over," I told him, "you will know what to do when you see the two Tarid warriors." His upper mouth stretched in one of his strange grins, and he purred contentedly.

I stepped to the sill of the window, and Ur Jan clambered to my side. The hull of the craft was almost scraping the side of the building; the doorway was only a foot from the sill on which we stood.

"Ready, Ur Jan," I whispered, and then I directed the brain to draw the doors aside as rapidly as possible.

Almost instantly, they sprang apart; and in the same instant Ur Jan and I sprang into the cabin. Behind us, came our three companions. In the gloom of the interior, I saw two men facing us; and without waiting to give either of them a chance to draw, I hurled myself at the legs of the nearer.

He crashed to the floor, and before he could draw his dagger I seized both his wrists and pinioned him on his back.

I did not see how Ur Jan handled his man; but a moment later, with the assistance of Jat Or and Umka, we had disarmed them both.

Ur Jan and Gar Nal wanted to kill them offhand, but that I would not listen to.

I can kill a man in a fair fight without a single qualm of conscience; but I cannot kill a defenseless man in cold blood, even though he be my enemy.

As a precautionary measure, we bound and gagged them.

"What now?" demanded Gar Nal. "How are you going to get the women?"

"First, I am going to try and get your ship," I replied, "for even if we extend our truce, we shall stand a better chance of returning to Barsoom if we have both ships in our possession, as something might happen to one of them."

"You are right," he said; "and, too, I should hate to lose my ship. It is the fruit of a lifetime of thought and study and labor."

I now caused the ship to rise and cruise away until I thought that it was out of sight of the castle. I adopted this course merely as a strategy to throw the Tarids off our track in the event that any of the guards had seen the ship maneuvering among the towers; but when we had gone some little distance, I dropped low and approached the castle again from the side where Gar Nal's ship lay in the courtyard.

I kept very low above the trees of the forest and moved very slowly without lights. Just beyond the castle wall, I brought the ship to a stop and surveyed the courtyard just ahead and below us.

Plainly I saw the outlines of Gar Nal's ship, but nowhere upon that side of the castle was there any sign of a guard.

This seemed almost too good to be true, and in a whisper I asked Umka if it could be possible that the castle was unguarded at night.

"There are guards within the castle all night," he said, "and upon the outside of the Tower of Diamonds, but these are to guard Ul Vas against assassination by his own people. They do not fear that any enemy will come from beyond the walls at night, for none has ever attacked except by day. The forests of Ladan are full of wild beasts; and if a body of men were to enter them at night, the beasts would set up such a din of howling and roaring that the Tarids would be warned in ample time to defend themselves; so you see, the beasts of the forest are all the guards they need."

Thus assured that there was no one in the courtyard, I took the ship across the wall and dropped it to the ground beside Gar Nal's.

Quickly I gave my instructions for what was to follow. "Gar Nal," I said, "you will go aboard your ship and pilot it, following me. We are going to the window of the room where the girls are confined. As I draw in and stop at their window, both the doors in the sides of my ship will be open. Open the door on the port side of your ship and place it alongside mine, so that if it is necessary you can cross through my ship and enter the room where the women are confined. We may need all the help that we have, if the women are well guarded."

CHAPTER XXI. IN THE TOWER OF DIAMONDS

Vague misgivings disturbed me as I saw Gar Nal enter his ship. They seemed a premonition of disaster, of tragedy; but I realized that they were based upon nothing more substantial than my natural dislike for the man, and so I sought to thrust them aside and devote my thoughts to the business in hand.

The night was dark. Neither Mars nor Cluros had risen. It was, indeed, because of the fact that I knew neither of them would be in the sky that I had chosen this hour for my attempt to rescue Dejah Thoris and her companion.

Presently I heard the motors of Gar Nal's ship, which we had decided should be the signal that he was ready to start. Leaving the ground, I rose from the courtyard, crossed the wall and set a course away from the city. This I held until I felt that we were out of sight of any possible watcher who might have discovered us. Trailing us was the dark hulk of Gar Nal's ship.

In a wide spiral, I rose and circled back to the opposite side of the castle; and then, approaching it more closely, I picked out the lofty Tower of Diamonds.

Somewhere in that gleaming shaft were Dejah Thoris and Zanda; and if Ozara had not betrayed me and if no accident had befallen her plan, the Jeddara of the Tarids was with them.

There had been moments when I had been somewhat concerned as to the honesty and loyalty of Ozara. If she had spoken the truth, then there was every reason why she should wish to escape from the clutches of Ul Vas. However, she might not be so enthusiastic about the escape of Dejah Thoris and Zanda.

I confess that I do not understand women. Some of the things that they do, their mental processes, are often inexplicable to me. Yes, I am a fool with women; yet I was not so stupid that I did not sense something in Ozara's manner toward me, something in the very fact that she had sent for me, that indicated an interest on the part of the Jeddara of the Tarids that might prove inimical to the interests of the Princess of Helium.

Ozara, Jeddara of the Tarids, however, was not the only doubtful factor in the problem which confronted me. I did not trust Gar Nal. I doubt that anyone who had once looked into the man's eyes could trust him. Ur Jan was my avowed enemy.

His every interest demanded that he either betray or destroy me.

Zanda must have learned by this time from Dejah Thoris that I was John Carter, Prince of Helium. That knowledge would, undoubtedly, free her from all sense of obligation to me; and I could not but recall that she had sworn to kill John Carter if ever the opportunity presented itself. This left only Jat Or and Umka upon whom I could depend; and, as a matter of fact, I was not depending too much upon Umka. His intentions might be good enough, but I knew too little of his fighting heart and ability to be able to definitely assure myself that the cat-man of Ladan would prove an important and effective ally.

As these discouraging thoughts were racing through my brain, I was causing the ship to drop slowly toward the Diamond Tower and circle it; and presently I saw a red scarf across the sill of a lighted window.

Silently the ship drew closer. The doors in both sides of the cabin were open to permit Gar Nal to cross from his ship to the window in the tower.

I stood upon the threshold of the port doorway, ready to leap into the room the instant that the ship drew close enough.

The interior of the room beyond the window was not brilliantly lighted, but in the dim illumination I could see the figures of three women, and my heart leaped with renewed hope.

The discovery of the scarlet scarf flying from the window had not wholly reassured me, as I was fully conscious of the fact that it might have been placed there as a lure; but the presence of the three women in the chamber appeared reasonable evidence that Ozara had carried out her part of the agreement loyally.