The next morning, the British were within a mile and a half of Baltimore, but they found fifteen thousand men, with a large train of artillery, in possession of the heights commanding the city. Colonel Brooke, not willing to incur the risk of attacking in daylight, with three thousand men, a fivefold number, resolved on attempting a surprise by night. He learned, however, that the enemy, by sinking twenty vessels in the river, had prevented all naval co-operation. The inevitable loss of life in an assault far counter-balancing any prospective advantage, Brooke wisely abandoned the design, and withdrew unmolested to his ships.