At two o'clock in the afternoon the buccaneers pushed through a thicket of liane and green cane, and debouched quite suddenly upon the barren hilltop facing San Lorenzo Castle. As they formed up, they were met with a thundering volley, which threw them into some confusion. They retreated to the cover of the jungle to debate a plan of battle, greatly fearing that a fort so strongly placed would be impregnable without great guns to batter it. However, they were a reckless company, careless of their lives, and hot with the tramping through the swamp. Give it up they could not, for fear of the mockery of their mates. The desperate course was the one course open to them. They lit the fireballs, or grenades, they had carried through the marsh; they drew their swords, and "Come on!" they cried. "Have at all!" And forward they stormed, cursing as they ran. A company in reserve remained behind in cover, firing over the storming party with their muskets. As the pirates threw themselves into the gully, the walls of San Lorenzo burst into a flame of gun fire. The Spaniards fought their cannon furiously--as fast as they could fire and reload--while the musketeers picked off the leaders from the loopholes. "Come on, ye English dogs!" they cried. "Come on, ye heretics! ye cuckolds! Let your skulking mates behind there come on too! You'll not get to Panama this bout." "Come on" the pirates did, with great gallantry. They flung themselves down into the ditch, and stormed up the opposite slope to the wooden palings. Here they made a desperate attempt to scale, but the foothold was too precarious and the pales too high. In a few roaring minutes the attack was at an end: it had withered away before the Spanish fire. The buccaneers were retreating in knots of one or two, leaving some seventy of their number on the sun-bleached rocks of the gully.