That all danger was past--that in a few hours we should be free--was the full belief both of my companion and myself. Perhaps you may not comprehend from what _data_ we drew so confident and comfortable a conclusion, though our reasoning was simple enough. We knew that Rube would reach the rancheria, and return with a rescue--that was all.

'Tis true we were not without some anxiety. The rangers might no longer be there?--the army might have marched?--perhaps the picket was withdrawn? Rube himself might be intercepted, or slain?

The last hypothesis gave us least concern. We had full trust in the trapper's ability to penetrate to the American camp--to the enemy's, if necessary. We had just been favoured with a specimen of his skill.

Whether the army had advanced or not, Rube would reach it before morning, if he should have to steal a horse upon the way. He would soon find the rangers; and, even without orders, Holingsworth would _lend_ him a few--half-a-dozen of them would be enough. In the worst view of the case, there were stragglers enough about the camp--odd birds, that could easily be enlisted for such a duty. We had scarcely a doubt that our comrade would come back with a rescue.

As to the time, we were left to conjectures. It might be before morning's light--it might not be before late in the following day, or even the night after. But that was a consideration that now weighed lightly. We could hold our aerial fortress for a week--a month--ay, far longer, and against hundreds. We could not be assailed. With our rifles to guard the cliff, no storming-party could approach--no forlorn hope could scale our battlements!

But what of thirst and hunger, you will ask?

Ha! we dreaded not either. Fortune's favours had fallen upon us in showers. Even on that lone summit, we found the means to assuage the one and satisfy the other!

In crossing the table-top, we stumbled upon huge _echino-cacti_, that grew over the ground like ant-hills or gigantic bee-hives. They were the _mamillaria_ of Quackenboss--dome-shaped, and some of them ten feet in diameter.

Garey's knife was out in a trice; a portion of the spinous coat of the largest was stripped off, its top truncated, and a bowl scooped in the soft succulent mass. In another minute we had assuaged our thirst from this vegetable fountain of the Desert.

With similar facility were we enabled to gratify the kindred appetite.

As I had conjectured, on viewing them from the plain, the trees of light-green foliage were "pinons"--the "nut-pine" (_Pinus edulis_), of which there are several species in Northern Mexico, whose cones contain seeds edible and nutritious. A few handfuls of these we gathered, and hungered no more. They would have been better roasted, but at that moment we were contented to eat them raw.

No wonder, then, that with such a supply for the present, and such hopes for the future, we no longer dreaded the impotent fury of our foes.

We lay down at the top of the gorge to watch their further movements, and cover our horses from their attack.

The flash of the lightning showed them still on guard, just as we had left them. One of each file was mounted, while his companion, on foot, paced to and fro in the intervals of the cordon. Their measures were cunningly taken; they were evidently determined we should not steal past them in the darkness!

The lightning began to abate, and the intervals between the flashes became longer and longer.

During one of these intervals, we were startled by the sound of hoof-strokes at some distance off: it was the tramp of horses upon the hard plain.

There is a difference between the hoof-stroke of a ridden horse and one that is riderless, and the prairie-man is rarely puzzled to distinguish them. My companion at once pronounced the horses to be "mounted."

The guerrilleros, on the alert, had heard them at the same time as we, and two of them had galloped out to reconnoitre. This we ascertained only by _hearing_, for we could not distinguish an object six feet from our faces--the darkness being almost palpable to the touch.

The sounds came from a considerable distance, but as they were continually growing more distinct we could tell that the horsemen were advancing _toward_ the mesa.

We drew no hope from this advent. Rube could not yet have even reached the rancheria. The new-comers were El Zorro and his companion on their return.

We were not kept long in doubt: the horsemen approached, and shouts and salutations were exchanged between them and the guerrilleros, while the horses of both parties neighed in response, as if they knew each other.

At this moment the lightning shone again, and to our surprise we perceived not only El Zorro, but a reinforcement of full thirty men!

The trampling of many hoofs had half prepared us for this discovery.

It was not without feelings of alarm that we beheld this accession to the enemy's strength. Surely they would no longer hesitate to assail our fortress behind the rock? At least then our horses would be captured? Besides, Rube's rescue might be too weak for such a force?

There were now nearly fifty of the guerrilleros.

Our anxiety as to the first two points was soon at an end. To our astonishment, we perceived that no assault was to be made as yet. We saw them increase the strength of their cordon of sentries, and make other dispositions to carry on the siege.

Evidently they regarded us as hunters do the grizzly bear, the lion, or tiger--not to be attacked in our lair. They dreaded the havoc which they well knew would be made by our rifles and revolvers; and they determined to reduce us by starvation. On no other principle could we account for the cowardly continence of their revenge.

CHAPTER FORTY ONE.

THE INDIAN SPY.

It was past the hour of midnight. The lightning, that for some time had appeared only at long intervals, now ceased altogether. Its fitful glare gave place to a softer, steadier light, for the moon had arisen, and was climbing up the eastern sky. Cumulus clouds still hung in the heavens, slowly floating across the canopy; but their masses were detached, and the azure firmament was visible through the spaces between. The beautiful planet Venus, and here and there a solitary star, twinkled in these blue voids, or gleamed through the filmy bordering of the clouds; but the chiefs of the constellations alone were visible. The moon's disc was clear and well defined, whiter from contrast with the dark cumuli: and her beam frosted the prairie till the grass looked hoar. There was neither mist nor mirage; the electric fluid had purged the atmosphere of its gases, and the air was cool, limpid, and bracing. Though the moon had passed the full, so brilliant was her beam, that an object could have been distinguished far off upon the plain, whose silvery level extended on all sides to the horizon.

The thick black clouds, however, moving silently over the sky, occasioned long intervals of eclipse, during which the prairie, as before, was shrouded in sombre darkness.

Up to this time, Garey and I had remained by the head of the little gorge, through which we had ascended. The moon was behind us, for the guerrilla was on the western side of the mesa. The shadow of the mound was thrown far out upon the plain, and just beyond its well-defined edge was the line of sentinels, thickly posted. On our knees among the low shrubbery, we were unseen by them, while we commanded a perfect view of the whole troop, as they smoked, chattered, shouted, and sang--for they gave such tokens of their jovial humour.

After quietly watching them for some time, Garey left me to take a turn round the summit, and reconnoitre the opposite or eastern side. In that direction lay the rancheria; and if the picket was still stationed there, we might soon expect the rescue. My rangers were not the men to tarry, called forth on such a duty; and, under Rube's guidance, they would be most likely to make their approach by the rear of the mound.

Garey, therefore, went in that direction to make his reconnaissance.

He had not parted from me more than a minute, when a dark object out upon the plain attracted my glance. I fancied it was the figure of a man; though it was prostrate and flattened against the ground, just as old Rube had appeared when making his escape!

Surely it was not he? I had but an indistinct view of it, for it was full six hundred yards from the mesa, and directly beyond the line of the guerrilleros. Just then a cloud crossing the moon's disc, shrouded the plain, and the dark object was no longer visible.

I kept my eyes fixed on the spot, and waited for the returning light.

When the cloud passed, the figure was no longer where I had first noticed it; but nearer to the horsemen I perceived the same object, and in the same attitude as before!

It was now within less than two hundred yards of the Mexican line, but a bunch of tufted grass appeared to shelter it from the eyes of the guerrilleros--since none of them gave any sign that it was perceived by them.

From my elevated position, the grass did not conceal it. I had a clear view of the figure, and was certain it was the body of a man, and, still more, of a _naked_ man--for it glistened under the sheen of the moonlight, as only a naked body would have done.

Up to this time I had fancied, or rather _feared_, it might be Rube. I say feared--for I had no wish to see Rube, upon his return, present himself in that fashion.

Surely he would not come back alone? And why should he be thus playing the spy, since he already knew the exact position of our enemy?

The apparition puzzled me, and I was for a while in doubt.

But the _naked_ body reassured me. It could not be Rube. The skin was of a dark hue, but so was that of the old trapper. Though born white, the sun, dirt, gunpowder, and grease, with the smoke of many a prairie-fire, had altered Rube's complexion to the true copper-tint; and in point of colour, he had but little advantage over a full-blood Indian. But Rube would not have been naked; he never doffed his buckskins. Besides, the oily glitter of that body was not Rube's; his "hide" would not have shone so under the moonlight. No; the prostrate form was not his.

Another cloud cast new shadows; and while these continued, I saw no more of the skulking figure.

As the moon again shone forth, I perceived that it was gone from behind the tuft of grass.

I scanned the ground in the immediate neighbourhood. It was not to be seen; but on looking farther out, I could just distinguish the figure of a man, bent forward and rapidly gliding away.

I followed it with my eyes until it disappeared in the distance, as though melting into the moonlight.

While gazing over the distant plain in the direction whence the figure had retreated, I was startled at beholding, not one, but many forms dimly outlined upon the prairie edge.

"It _was_ Rube," thought I; "and yonder are the rangers!"

I strained my eyes to the utmost. They were horsemen beyond a doubt; but, to my astonishment, instead of being close together, one followed another in single file, until a long line was traced against the sky like the links of a gigantic chain.

Except in the narrow defile, or the forest-path, my rangers never rode in that fashion. It could not be they!