On the 12th of September a more serious assault was made upon Baltimore. The British naval and military forces united in the attack, which was made by land and sea. A force of nine thousand men, including two thousand marines and two thousand sailors, was landed fifteen miles from Baltimore, and under the command of Gen. Ross and Admiral Cockburn marched gayly inland, never doubting that they would find the Americans unprepared, and repeat their exploits at Washington. In this expectation they were sadly disappointed; for the Maryland militia, aided by a few regulars and seamen, outfought the British at every point, and checked their farther advance. Among the slain was Gen. Ross, who was shot down as he was leading the advance of the British skirmishers. In the mean time, the British fleet had been taking its share in the engagement by attempting to reduce Fort McHenry. A large flotilla of frigates, schooners, sloops, and bomb-ketches entered the Patapsco River on the morning of the 12th, and, casting anchor out of the reach of the fort's guns, opened a furious fire. The fort was manned by militia-men and a large detachment of the gallant sailors from Barney's flotilla. When the continual falling of shells within the fort told that the enemy had come within range, the guns of Fort McHenry opened in response. But, to the intense chagrin of the Americans, it was found that their works mounted not a single gun that would carry to the enemy's fleet. There then remained to the garrison only the trying duty of holding their post, and enduring without response a galling fire from the enemy. All the garrison stood to the guns without flinching; while the shrieking shells fell on all sides, and, exploding, scattered deadly missiles in all directions. One shell struck and dismounted one of the twenty-four-pounders, killing and wounding several of its men. Admiral Cochrane, who commanded the attacking fleet, saw this incident, and ordered three of his bomb-vessels to move up nearer to the fort. This gave the Americans the opportunity for which they had been longing, and instantly every gun in the fort opened upon the three luckless ketches. Half an hour of this fire sufficed to drive the three vessels back to their original station.