“‘The bulk of the powder,’ he answered, ‘is in the vault below the citadel.’
“‘Where is the rest of it?’ I whispered.
“‘In the lower room of the round tower by the gate.’
“‘Nonsense,’ I said: ‘they would never store it in a place so liable to attack.’
“‘There was nowhere else to put it,’ replied the sentinel, ‘unless they left it in the open courtyard, which would be quite as unsafe.’
“‘Is the door to the lower room in the tower bolted?’
“‘There is no door,’ replied the sentry, ‘but a low archway. This archway has not been closed, because no cannon-balls ever come from the northern side.’
“‘How much powder is there in this room?’
“‘I do not know; nine or ten barrels, I think.’
“It was evident to me that the fellow, in his fear, spoke the truth. Now, the question was, how to get down from the wall into the courtyard and across that to the archway at the southern side? Cautioning the sentinel again, that if he made the slightest attempt to escape or give the alarm, instant death would be meted to him, I told him to guide us to the archway, which he did, down the stone steps that led from the northern wall into the courtyard. They seemed to keep loose watch inside, the only sentinels in the place being those on the upper walls. But the man we had captured not appearing at his corner in time, his comrade on the western side became alarmed, spoke to him, and obtaining no answer, shouted for him, then discharged his gun. Instantly the place was in an uproar. Lights flashed, and from different guard-rooms soldiers poured out. I saw across the courtyard the archway the sentinel had spoken of, and calling my men made a dash for it. The besieged garrison, not expecting an enemy within, had been rushing up the stone steps at each side to the outer wall to man the cannon they had so recently quitted, and it was some minutes before a knowledge of the real state of things came to them. These few minutes were all we needed, but I saw there was no chance for a slow match, while if we fired the mine we probably would die under the tottering tower.