The Russians had now been a month before the walls of Kezan. Ten thousand of the defenders had already been slain. The autumnal sun was rapidly declining, and the storms of winter were approaching. Secretly they now constructed, a mile and a half from the camp, an immense tower upon wheels, and rising higher than the walls of the city. Upon the platform of this tower they placed sixteen cannon, of the largest caliber, which were worked by the most skillful gunners. In the night this terrible machine was rolled up to the walls, and with the first dawn of the morning opened its fire upon the dwellings and the streets. The carnage was at first horrible, but the besieged at length took refuge in subterranean walks and covered ways, where they indomitably continued the conflict. The artillery, placed upon the walls of Kezan, were speedily dismounted by the batteries on the tower. A new series of mines beneath the walls were now constructed by the Russian engineers, which were to operate with destructive power, hitherto unrecorded in the annals of war. On the 1st of October the tzar announced to the army that the mines were ready to be fired, and wished them to prepare for the general assault. While one half of the troops continued the incessant bombardment, the other half were assembled in the churches to purify themselves for the conflict by confession, penitence, prayer and the partaking of the sacrament of the Lord's Supper. The divisions then exchanged that the whole army might prostrate itself before God. Ivan IV. himself retired with his confessor and passed several hours in earnest devotion. The night preceding the assault there was no repose in either camp. The Kezanians, who were anxiously awaiting events, had perceived an extraordinary movement among the Russians, as each battalion was guided to the spot whence it was to rush over the ruins immediately after the explosion. Forty-eight tons _(tonneaux)_ of powder had been placed in the mines.