As the day wore on, counter-battery fire from Fort Pulaski were gradually silenced as their guns were either dismounted or rendered unserviceable. Two of the Federal 10-inch columbiads jumped backwards off their carriages. The 13-inch mortars placed less than 10% rounds on target. But Federal fire proved effective from Parrott and James rifles, and working columbiad guns. There ensued a lull from the Fort, but the Confederate gunners re-opened an energetic counter battery duel that required the Parrotts to give up their wall assignment and concentrate on the working Confederate guns until they were re-silenced. By nightfall the wall at the southeast corner had been breached. Under periodic harassing bombardment throughout the hours of darkness, Olmstead's garrison put several guns back into service.