About a week after these measures had been taken, one night, as the superintendent of the watch, who had been inspecting the lower dormitory in the Bâtiment-Neuf, was about to drop his chestnut in the box⁠—this was the means adopted to make sure that the watchmen performed their duties punctually; every hour a chestnut must be dropped into all the boxes nailed to the doors of the dormitories⁠—a watchman looked through the peephole of the dormitory and beheld Brujon sitting on his bed and writing something by the light of the hall-lamp. The guardian entered, Brujon was put in a solitary cell for a month, but they were not able to seize what he had written. The police learned nothing further about it.

What is certain is, that on the following morning, a “postilion” was flung from the Charlemagne yard into the Lions’ Ditch, over the five-story building which separated the two courtyards.