The Arabs themselves were supposed to be sufficiently intelligent to tell a friend from a foe without requiring any countersign.

Before Bill was sent upon his beat the old sheik went into a tent, and soon after reappeared with a large pistol, bearing a strong likeness to a blunderbuss. This weapon he placed in the sailor’s hand, with the injunction, translated to him by the interpreter, not to discharge it until he should be certain of killing either Golah, or one of his companions.

The old sailor, although sorely fatigued with the toil of the day’s journey, had so great a horror of again becoming the property of the black sheik, that he cheerfully promised to “walk the deck all night, and keep a good look-out for breakers,” and his young companions sought repose in full confidence that the promise would be faithfully kept.

Any one of the boy slaves would willingly have taken his place, and allowed their old comrade to rest for the night, but Bill had been selected by the old sheik, and from his decree there was no appeal.

The two Arabs doing duty as sentinels knew, from past experience, that if the kafila was still followed by Golah, they would be the individuals most exposed to danger, and this knowledge was sufficient to stimulate them to the most faithful discharge of their trust.

Neither of them wished to become victims to the fate which had befallen their predecessors in office.

For two or three hours both paced slowly to and fro; and Bill, each time he approached the end of his beat, could hear distinctly pronounced the word “Akka” which proved that his co-sentinels were fully on the alert.

It so chanced that one of them had no faith in the general belief that the enemy had relinquished his sanguinary purposes of vengeance.

He drew his deductions from Golah’s conduct in the past, and during the long silent hours of the night his fancy was constantly dwelling on the manner in which the dreaded enemy had approached the douar on former occasions.

This sentry was the one stationed to the south of the douar; and with eyes constantly striving to pierce the darkness that shrouded the sand-plain, the water, on which a better light was reflected, received no attention from him. He believed the douar well protected on the side of the sea, for he had no idea that danger could come from that direction.