They went out, locking the door behind them; and then the baron rose from his knees. All sorts of contradictory ideas, doubts, and conjectures filled his mind. What could this letter have contained? Why had not Chanlouineau used it to procure his own salvation? Who would have believed that Martial would be so faithful to a promise wrested from him by threats? But this was a time for action, not for reflection. The bars were heavy, and there were two rows of them. M. d’Escorval set to work. He had supposed that the task would be difficult, but, as he almost immediately discovered, it proved a thousand times more arduous than he had expected. It was the first time that he had ever worked with a file, and he did not know how to use it. His progress was despairingly slow. Nor was that all. Though he worked as cautiously as possible, each movement of the instrument across the iron caused a harsh, grating sound which made him tremble. What if some one overheard this noise? And it seemed to him impossible for it to escape notice, since he could plainly distinguish the measured tread of the guards, who had resumed their watch in the corridor. So slight was the result of his labours, that at the end of twenty minutes he experienced a feeling of profound discouragement. At this rate, it would be impossible for him to sever the first bar before daybreak. What, then, was the use of spending his time in fruitless labour? Why mar the dignity of death by the disgrace of an unsuccessful effort to escape? He was hesitating when footsteps approached his cell. At once he left the window and seated himself at the table. Almost directly afterwards the door opened and a soldier entered; an officer who did not cross the threshold remarking at the same moment: “You have your instructions, corporal, keep a close watch. If the prisoner needs anything, call.” M. d’Escorval’s heart throbbed almost to bursting. What was coming now? Had M. de Courtornieu’s advice carried the day, or had Martial sent some one to assist him? But the door was scarcely closed when the corporal whispered: “We must not be dawdling here.” M. d’Escorval sprang from his chair. This man was a friend. Here was help and life. “I am Bavois,” continued the corporal. “Some one said to me just now: ‘One of the emperor’s friends is in danger; are you willing to lend him a helping hand!’ I replied, ‘Present,’ and here I am.” This certainly was a brave fellow. The baron held out his hand, and in a voice trembling with emotion: “Thanks,” said he; “thanks. What, you don’t even know me, and yet you expose yourself to the greatest danger for my sake.” Bavois shrugged his shoulders disdainfully. “Positively my old hide is no more precious than yours. If we don’t succeed they will chop off our heads with the same ax. But we _shall_ succeed. Now, let’s stop talking and proceed to business.”