That day passed off without further attack from the enemy, who seemed to have drawn off to a distance; and as night fell the colonel became very anxious about the patrol, which had not returned. Dickenson, who had the credit of being the longest-sighted man in the regiment, had spent the day on the highest point of the kopje, armed with a powerful telescope, and from his point of vantage, where he could command the country in that wonderfully clear atmosphere for miles round, had swept every bit of plain, and searched bush and pile of granite again and again, till the darkness of evening began to fill up the bush like a flood of something fluid. When he could do no more he left the crew of the gun and began to descend by what he considered the nearest way to headquarters, and soon found it the longest, for he had delayed his return too long. "Hang it all!" he muttered. "What a pile of shin-breaking rocks it is! I've a jolly good mind to go back and take the regular path; seems so stupid, though, now." In this spirit he persevered, wandering in and out among the piled-up blocks, all of which seemed in the darkness to be exactly alike, often making him think that he was going over the same ground again and again. But he was still descending, for when he climbed up the next suitable place to try and get a view of the lights of the camp he could see them beneath him and certainly nearer than when he started. "Shall manage it somehow," he muttered; "but, hang it! how hungry I am! There, I'll have a pipe." He fumbled in his pocket as he stood in the lee of a block of granite, sheltered from the cold night wind, found the pipe, and raised it to his lips to blow through the stem, but stopped short with every sense on the alert, for from below to his left he heard a light chirp such as might have been given by a bird, but which he argued certainly was not, for he knew of no bird likely to utter such a note at that time of the evening, when the flood of darkness had risen and risen till it had filled up everything high above the highest kopje that dotted the plain. "Couldn't be a signal, could it?" he said to himself. "Yes," he said directly after, for the chirp was answered from lower down. Dickenson softly swung the case of his telescope round to his back out of the way, and took out his revolver without making a sound, listening intently the while, and at the end of a long minute he made out a low whispering close at hand; but he could not place it exactly, for the sounds seemed to be reflected back from the face of the rock directly in front of him. "I wish it wasn't so dark," he said, and screwing up his lips, he tried to imitate the chirp, and so successfully that it was answered. "Must be one of our sentries," he thought, and he hesitated as to his next proceeding. "Don't want to challenge and raise a false alarm," he said; "but last night's work makes one so suspicious. I'll let them challenge me."