It took four hours' work, that night, to get through the bars. They were most careful not to let any of the filings fall outside for, had any of them dropped into the courtyard below, they might well catch the eye of a warder; and in that case an examination of all the windows of the rooms above would certainly be made, at once. Before the warder's visit the next morning, the holes had been filled up with bread worked into a putty and smeared over with dust; which so nearly matched the bars that it could not be observed, except by a careful examination. The next day they abstained from saying more than a passing word to any of the French soldiers. They waited, after being locked up for the night, for two or three hours; and then began their work at the door. The saw was a very narrow one and, when they had made a hole with the augur, they found no difficulty in cutting the wood; therefore they thought it was well to leave that for the last thing, and so betook themselves to their files, and soon removed enough of the bars to enable a man to crawl through. Then they returned to the door, and had cut round the lock, and made holes through which they could pass their hands to draw back the bolts, a short time before the clock struck twelve. Then they went to the window, and listened. They heard the bells strike midnight, and then a stir below, as the sentries were relieved. Waiting for a few minutes, until all had become quiet again, they drew back the bolts, took off their shoes, and went noiselessly down the stairs. The night was very dark and, although they could hear the tread of the sentries in the courtyard, they could not make out their figures. They crossed the yard, keeping as far as possible from the sentries. They had no doubt that all would happen as arranged; but there was, of course, the possibility that at the last moment some change might have been made; and it was, in any case, as well that the men there should be able to declare, honestly, that they had seen no one. [Illustration: Stooping so that their figures should not show against the sky.] They were glad when they reached the archway leading to the stairs that led to the top of the wall. Mounting, they kept along by the parapet, stooping so that their figures should not show against the sky for, dark as it was below, they might have been noticed had they not done so. Presently they saw the sentry. "Diable, messieurs!" he said in a low tone, as they came up to him, "you gave me a start. I was expecting you, but I did not hear your footsteps nor see you and, had you been enemies, you might very well have seized and disarmed me before I could give the alarm. "Well, here are your clothes."