Looking along the platform, Stewart saw approaching the head of an infantry column. In a moment, the soldiers were clambering into the coaches, with the same mathematical precision he had seen before. But there was something unfamiliar in their appearance; and, looking more closely, Stewart saw that their spiked helmets were covered with gray cloth, and that not a button or bit of gilt glittered anywhere on the gray-green field uniforms. Wonderful forethought, he told himself. By night these troops would be quite invisible; by day they would be merged indistinguishably with the brown soil of the fields, the gray trunks of trees, the green of hedges. The train rolled slowly out of the station, and Stewart saw that on the track beyond there was another, also loaded with troops. In a moment, it started westward after the first; and beyond it a third train lay revealed. Stewart, glancing at his companion, was startled by the whiteness of her face, the steely glitter of her eyes. "It looks like a regular invasion," he said. "But let us find out what's going to happen to us. We can't stand here all night. Good heavens--what is that?" From the air above them came the sudden savage whirr of a powerful engine, and, looking up, they saw a giant shape sweep across the sky. It was gone in an instant. "A Zeppelin!" said Stewart, and felt within himself a thrill of wonder and exultation. Oh, this would be a great war! It would be like no other ever seen upon this earth. It would be fought in the air, as well as on the land; in the depths of the ocean, as well as on its surface. At last all theories were to be put to the supreme test! "You will come with me," said the man in the helmet, and Stewart, with a nod, picked up his grips again before he remembered that he was supposed to be ignorant of German. "Did you say there was another train?" he asked. "Shall we be able to get away?" The man shook his head and led the way along the platform, without glancing to the right or left. As they passed the bare little station, they saw that it was jammed to the doors with men and women and children, mixed in an indiscriminate mass, and evidently most uncomfortable. But their guide led them past it without stopping, and Stewart breathed a sigh of relief. Anything would be better than to be thrust into that crowd! Again he had cause to wonder at the length of that interminable platform; but at last, near its farther end, their guide stopped before a small, square structure, whose use Stewart could not even guess, and flung open the door. "You will enter here," he said. "But look here," Stewart protested, "we are American citizens. You have no right----" The man signed to them to hurry. There was something in the gesture which stopped the words on Stewart's lips. "Oh, damn the fool!" he growled, swallowing hard. "Come along, my dear; there's no use to argue," and, bending his head at the low door, he stepped inside.