He had burst into the engine-room so suddenly, with his men at his heels, that the engineer and his assistants had been too surprised to resist, in spite of the fact that not one of the prisoners, save the colonel himself, was armed--the colonel having appropriated one of Frank's revolvers. When Jack sprang into the room it was with his revolver held ready for instant use. In a trice lit took in the situation, and realized that it was no time for talk. The stokers, the engineer and his assistant were standing helpless, evidently awed by the larger number of Germans. Jack's revolver spoke, and Colonel Von Roth's hat leaped from his head. In his hurry Jack's aim had been poor. The German officer whirled and his revolver also rang out. Jack felt a sting in his left arm, but he did not pause. Right into the middle of the crowd of Germans he sprang, his revolver spitting fire as he leaped. Down went three Germans, and then Jack was in among them. The tenth and last shot of his automatic went squarely into the face of a German soldier. Battling desperately the Germans leaped upon him and overwhelmed him. So closely entwined were the struggling men that Jack was unable to take the time to draw his second revolver; but he was not daunted. His fighting blood was up, and he hurled his six feet of height and 178 pounds of weight into the thick of the conflict. His revolver reversed in his hand, he struck out often and fiercely. Here and there the sound of a crunch told him a blow had landed. But he had no time to investigate; the press was too thick. By this time the engineer, his assistant and the stokers had recovered from their surprise and rushed to Jack's aid. Friend and foe alike grabbed up whatever weapon they could lay their hands on wrenches, hand-bars and heavy iron pokers. Guarding his head as well as he could with one upraised arm, Jack struck right and left with his revolver butt. A man sprang at him with a heavy wrench, but the lad caught it, by a quick move, on his revolver. It saved his head, but the weapon went to the floor in a thousand pieces. Jack grappled with this antagonist, and, by a quick twist of the arm, whipped the wrench from his opponent's hand. It rose and fell and the German toppled over. Colonel Von Roth, now the only man in the room armed, stood off to one side, trying in vain to bring his revolver to bear upon Jack. He was afraid to fire, however, for fear of hitting one of his own men. Hither and thither he darted around the struggling mass of men, attempting to get a clear shot at the lad. Suddenly Jack stooped near the door of one of the furnaces and picked up a heavy iron poker. With this he laid about him right lustily, and in a moment had cleared a little circle about himself. The rest of the English, driven back by the Germans, were still fighting desperately at the opposite side of the room.