While this caused substantial damage to the roof and upper works, the fort was otherwise untouched. On the night of 31 March, Scott sent out 150 men to destroy the Jacobite battery; timed to occur when the guard was being relieved, it was left unprotected at the crucial moment. The attackers captured or spiked four 6-inch mortars along with three 4-pounder and one 6-pounder cannon. They then attacked the battery above the Governor's garden but lacking the element of surprise were repulsed. Reinforced by Scott, the assault party returned safely to the fort; casualties were estimated as eleven or twelve on each side.