The stream is reached and crossed; amidst plashing spray, horse follows horse over the shallow ford, and then the glittering line glides on.

Having passed the river lowlands, it ascends the high plains that overlook the valley of San Ildefonso.

Here a halt is made—scouts are sent forward—and once more the line moves on.

Its head reaches the cliff of La Niña just as the moon has sunk behind the snowy summit of the Sierra Blanca. For the last hour the leader has been marching slowly, as though he waited her going down. Her light is no longer desired. Darkness better befits the deed that is to be done.

A halt is made until the pass has been reconnoitred. That done, the White Chief guides his followers down the defile; and in another half-hour the five hundred horsemen have silently disappeared within the mazes of the chapparal!

Under the guidance of the half-blood Antonio, an open glade is found near the centre of the thicket. Here the horsemen dismount and tie their horses to the trees. The attack is to be made on foot.

It is now the hour after midnight. The moon has been down for some time; and the cirrus clouds, that for a while had reflected her light, have been gradually growing darker. Objects can no longer be distinguished at the distance of twenty feet. The huge pile of the Presidio, looming against the leaden sky, looks black and gloomy. The sentinel cannot be seen upon the turrets, but at intervals his shrill voice uttering the “Centinela alerte!” tells that he is at his post. His call is answered by the sentinel at the gate below, and then all is silent. The garrison sleeps secure—even the night-guard in the zaguan with their bodies extended along the stone banqueta, are sleeping soundly.

The Presidio dreads no sudden attack—there has been no rumour of Indian incursion—the neighbouring tribes are all en paz; and the Tagno conspirators have been destroyed. Greater vigilance would be superfluous. A sentry upon the azotea, and another by the gate, are deemed sufficient for the ordinary guardianship of the garrison. Ha! the inmates of the Presidio little dream of the enemy that is nigh:

Centinela alerte!” once more screams the watcher upon the wall. “Centinela alerte!” answers the other by the gate.

But neither is sufficiently on the alert to perceive the dark forms that, prostrate upon the ground, like huge lizards, are crawling forward to the very walls. Slowly and silently these forms are moving, amidst weeds and grass, gradually drawing nearer to the gateway of the Presidio.