Cockburn's boast to Key that the reduction of the city would be "a matter of a few hours" did not look improbable. It was garrisoned by a small force of regulars under General Armistead, assisted by some volunteer artillerists under Judge Nicholson. It was armed with forty-two pounders, and some cannon of smaller caliber, but all totally ineffective to reach the British ships in their chosen position. In addition, a small earth battery at the Lazaretto--which, it will be seen, did good service--guarded the important approach to the city by the north branch of the Patapsco; while Fort Coventry protected the south branch. These batteries were armed only with eighteen and twenty-four pounders. From seven on the morning of Tuesday until after midnight of Wednesday the fleet bombarded Fort McHenry at long range; occasionally the gunners in the fort fired a useless shot at the ships. But at midnight word was brought to Cockburn that the land attack on the North Point road to the east of the city had failed. Therefore, unless the fleet could take Fort McHenry on the west, retreat was inevitable. Taking advantage of the darkness, a little after midnight sixteen British frigates, with bomb-ketches and barges, moved up within close range. At one o'clock they suddenly opened a tremendous and destructive fire upon the fort. Five hundred bombs fell within the ramparts; many more burst over them. The crisis of the fight came when, in the darkness, a rocket ship and five barges attempted to pass up the north channel to the city. They were not perceived until the British, thinking themselves safe and the ruse successful, gave a derisive cheer at the fort under whose guns they had passed. In avoiding Fort McHenry, however, they had fallen under the guns of the fort at the Lazaretto, on the opposite side of the channel. This fort, opening fire, so crippled the daring vessels that some of them had to be towed out in their hasty retreat. From midnight till morning Key could know nothing of the fortunes of the fight. At such close quarters a dense smoke enveloped both the ships and the fort, and added to the blackness of the night. After the failure to ascend the north branch of the Patapsco, the firing slackened. Now and then a sullen and spiteful gun shot its flame from the side of a British vessel. Key, pacing the deck of the cartel ship, to which he had been transferred, could not guess the cause of this. The slackened fire might mean the success of the land attack, in which case it would not have been necessary to waste any more powder on the fort. Again, it might be that the infernal rain of shells had dismantled the little fort itself, and the enemy was only keeping up a precautionary fire until daylight enabled him to take possession. The long hours were nearly unbearable. Key had seen the fate of Washington, and anticipated the fate of Baltimore.