Finding himself thus persistently foiled, the officer in command slightly altered his tactics; and, while instructing his artillery to persistently shell every bit of timber or other cover that could possibly afford concealment to the defenders, deployed his infantry into a column of open order and threw out a strong firing line, with instructions to them to advance, taking advantage of every bit of cover that they could find, and shoot at every puff of smoke that they could see. As on the occasion of the previous attack, many of the Spanish shells failed to burst; but, notwithstanding this, a few casualties now began to occur among Jack's party of defenders, and he therefore decided that the moment had arrived for bringing his twelve-pounder into action. This gun, accordingly, which Jack had by this time got mounted on a cleverly-constructed and carefully-masked earth battery, now opened fire upon the enemy's artillery; and as Singleton had personally laid the piece, and knew the exact range to practically an inch, he was lucky enough to dismount and put out of action one of the Spanish guns with his first shot, while his second swept away every one of the artillerymen from the gun next to it. His third and fourth shots did comparatively little damage; but his fifth shell struck one of the guns fair upon the muzzle, at the precise moment when it was being fired, with the result that both shells burst simultaneously, completely shattering the fore part of the gun, as far back as the trunnions, and scattering death and destruction broadcast among the rest of the artillerymen. But by this time the Spanish gunners had managed to locate the position of the weapon that was punishing them so fearfully, and from that moment they devoted their attention exclusively to it, with the result that shells began to drop thick and fast about Jack's ears, smothering and half-blinding him with dust, and occasionally peppering him pretty smartly with the pebbles and fragments of stone that were mingled with the earth of which his battery was composed. Still he gallantly maintained the unequal fight, and actually succeeded in disabling four out of the six guns ere a splinter of shell struck him on the temple and knocked him senseless. When he recovered, he found that darkness was closing down; that he was in his own room and on his own bed, whither he had been brought by an ambulance party of his men; and that Mama Faquita, poor Senorita Isolda's nurse, had taken him in charge, cleaned and dressed his wound, and was looking after him generally. An intermittent crackle of rifle fire told him that the attack was still being pressed, but Faquita informed him that there had been very few serious casualties thus far, and that all was going well. The old woman would fain have kept him confined to his room; but Jack knew that with the darkness would come the real danger, and despite his nurse's vehement protests he not only rose from his bed, but returned to