From the summits of the strong projections, which jutted like galleries from every direction along the entire height of the escarped walls to prevent the planting of scaling-ladders, soldiers looked through the embrasures at the advancing convicts; yet the archers had replaced their arrows in the quivers, for the watchmen in the towers perceived how few were the numbers of the approaching troop, and a messenger had already delivered to the commander of the garrison an order from his superior authorizing him to permit the passage of the prisoners. The gate of the palisade was now opened, and the captain of the guards allowed the prisoners to lie down on the glowing pavement within. No one could escape hence, even if the guards withdrew; for the high fence was almost insurmountable, and from the battlements on the top of the jutting walls darts could easily reach a fugitive. The ex-chief did not fail to note that everything was ready, as if in the midst of war, for defence against a foe. Every man was at his post, and beside the huge brazen disk on the tower stood sentinels, each holding in his hand a heavy club to deal a blow at the approach of the expected enemy; for though as far as the eye could reach, neither tree nor house was visible, the sound of the metal plate would be heard at the next fortress in the Etham line, and warn or summon its garrison. To be stationed in the solitude of this wilderness was not a punishment, but a misfortune; and the commander of the army therefore provided that the same troops should never remain long in the desert. Joshua himself, in former days, had been in command of the most southerly of these fortresses, called the Migdol of the South; for each one of the fortifications bore the name of Migdol, which in the Semitic tongue means the tower of a fortress. His people were evidently expected here; and it was not to be supposed that Moses had led the tribes back to Egypt. So they must have remained in Succoth or have turned southward. But in that direction rolled the waters of the Bitter Lakes and the Red Sea, and how could the Hebrew hosts pass through the deep waters? Hosea's heart throbbed anxiously at this thought, and all his fears were to find speedy confirmation; for he heard the commander of the fortress tell the captain of the prisoners' guards, that the Hebrews had approached the line of fortifications several days before, but soon after, without assaulting the garrison, had turned southward. Since then they seemed to have been wandering in the desert between Pithom and the Red Sea.