of a line of American merchant ships at the adjacent entrance to Baltimore Harbor in order to further thwart the passage of British ships. The attack began on September 13, as the British fleet of some nineteen ships began pounding the fort with Congreve rockets (from rocket vessel HMS Erebus) and mortar shells (from bomb vessels Terror, Volcano, Meteor, Devastation, and Aetna). After an initial exchange of fire, the British fleet withdrew to just beyond the range of Fort McHenry's cannons and continued to bombard the American redoubts for the next 25 hours. Although 1,500 to 1,800 cannonballs were launched at the fort, damage was light because of recent fortification that had been completed prior to the battle. After nightfall, Cochrane ordered a landing to be made by small boats to the shore just west of the fort, away from the harbor opening on which the fort's defense was concentrated. He hoped that the landing party might slip past Fort McHenry and draw Smith's army away from the main British land assault on the city's eastern border. That gave the British a good diversion for half an hour and allowed them to fire again and again. On the morning of September 14, the oversized American flag, which had been made a year earlier by local flagmaker Mary Pickersgill and her 13-year-old daughter, was raised over Fort McHenry, replacing the tattered storm flag which had flown during battle. It was responded to by a small encampment of British riflemen on the right flank, who fired a round each at the sky and taunted the Americans just before they too returned to the shore line. Originally, historians said that the oversized Star Spangled Banner Flag was raised to taunt the British, but that is not the case. The oversized flag was used every morning for reveille, as was the case on the morning of September 14. Brooke had been instructed not to attack the American positions around Baltimore unless he was certain that there were fewer than 2,000 men in the fort. Because of his orders, Brooke had to withdraw from his positions and returned to the fleet, which would set sail for New Orleans. Aftermath Colonel Brooke's troops withdrew, and Admiral Cochrane's fleet sailed off to regroup before his next (and final) assault on the United States, at the Battle of New Orleans. Armistead was soon promoted to lieutenant colonel. Much