In a moment when the attention of the sentry guarding the captives had been attracted elsewhere, Von Roth sneaked up on him from behind and struck him a heavy blow with his fist. Then, tying the prostrate man, the colonel had possessed himself of the guard's key and removed the irons from some of the German prisoners.

He did not wait to release all of them, for he was too anxious to try his plan of retaking the ship. Therefore, when he had freed twenty-five men, he led them quickly to the engine-room, thinking first to capture their strategic point and to take care of the rest of the ship's crew later.

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.