On 9 June, the British gunners hit a major Spanish magazine, which exploded. The main explosion was followed by a host of minor ones, as expense magazines, subsidiary stores and shells blew up. The Spanish lines were in pandemonium as the troops struggled to put out the numerous fires that started in their camp. Eventually order was restored and the fires failed to halt the battery-building efforts of the Spanish. By late 1781 there were around fifty mortars, bringing the besiegers' total to 114 guns, ranging from heavy 24-pounders to twelve-inch mortars.