Then I found a tiny handkerchief close to the outer wall. Lys had been stolen! It was all too plain. Some hideous member of the ape-man tribe had entered the fort and carried her off. While I stood stunned and horrified at the frightful evidence before me, there came from the direction of the great lake an increasing sound that rose to the volume of a shriek. We all looked up as the noise approached apparently just above us, and a moment later there followed a terrific explosion which hurled us to the ground. When we clambered to our feet, we saw a large section of the west wall torn and shattered. It was Olson who first recovered from his daze sufficiently to guess the explanation of the phenomenon. “A shell!” he cried. “And there ain’t no shells in Caspak besides what’s on the _U_-33. The dirty boches are shellin’ the fort. Come on!” And he grasped his rifle and started on a run toward the lake. It was over two miles, but we did not pause until the harbor was in view, and still we could not see the lake because of the sandstone cliffs which intervened. We ran as fast as we could around the lower end of the harbor, scrambled up the cliffs and at last stood upon their summit in full view of the lake. Far away down the coast, toward the river through which we had come to reach the lake, we saw upon the surface the outline of the _U_-33, black smoke vomiting from her funnel. Von Schoenvorts had succeeded in refining the oil! The cur had broken his every pledge and was leaving us there to our fates. He had even shelled the fort as a parting compliment; nor could anything have been more truly Prussian than this leave-taking of the Baron Friedrich von Schoenvorts. Olson, Whitely, Wilson, and I stood for a moment looking at one another. It seemed incredible that man could be so perfidious—that we had really seen with our own eyes the thing that we had seen; but when we returned to the fort, the shattered wall gave us ample evidence that there was no mistake. Then we began to speculate as to whether it had been an ape-man or a Prussian that had abducted Lys. From what we knew of von Schoenvorts, we would not have been surprised at anything from him; but the footprints by the spring seemed indisputable evidence that one of Caprona’s undeveloped men had borne off the girl I loved. As soon as I had assured myself that such was the case, I made my preparations to follow and rescue her. Olson, Whitely, and Wilson each wished to accompany me; but I told them that they were needed here, since with Bradley’s party still absent and the Germans gone it was necessary that we conserve our force as far as might be possible. Chapter 8