The advance guard was some distance ahead of the launch, which had to go slowly because of the unwieldiness of its burden, and the risk of striking the overlapping wings of the aeroplane against some irregularity in the surface of the bank. There was thus no reason to fear that the conflict would start prematurely through the obstruction of the launch before the horsemen had arrived. The men were riding easily; the two officers were engaged in animated conversation; in this wide no man's land between the rivers they had no cause for apprehension. Burnet, holding his revolver, tingled as the enemy drew slowly nearer. It was not his first action, but a youth of twenty cannot know the coolness and indifference of the veteran. His one anxiety was for the safety of Captain Ellingford. Knowing that he was on board, the Arabs would not fire at the launch; but in the confusion and hurly-burly of the coming fight he might be struck by a chance shot; perhaps, indeed, he might be deliberately murdered by the Turks in charge of him. "Thank Heaven they are not Germans," Burnet thought. The advance guard came to the edge of the ruins, riding along the embankment, which was only a foot or two above the general level, with a gentle slope on the southern side. The troopers glanced to right and left without particular care; and indeed it would have needed keener eyes than theirs to discover the men ambushed in snug positions a few hundred yards on the north side of the stream, or the horsemen securely hidden in the tall rushes at a rather greater distance to the south. They passed by without suspicion. About a hundred yards behind them the two officers came within the circle of the ruins, still chatting together. Their orderlies were a few paces in the rear; and the head of the short column of troopers, in line with the launch, rode at an equal interval behind them. To Burnet, at least, their progress seemed painfully slow. The advance guard had reached the western extremity of the ruins before the officers came level with the dam. Burnet was just wondering whether the dam would escape their notice when there was a sudden crackle of musketry from the northern side. The officer nearest the wady fell from his horse; several saddles in the column behind were emptied; and there ensued a scene of wild confusion. The horses curvetted, and drove against one another; the men shouted and gazed about them irresolutely, seeking the unseen enemy and trying to control their steeds. Another volley struck down several more horses and men; then, just as the launch, coming stern foremost, crashed into the obstacle, Rejeb and Burnet, at the head of a compact body of horsemen with swords held aloft, dashed from the shelter of the reeds and rode at a hot gallop straight for the centre of the column.