Armed with the knowledge gained from their prisoners, Alvarado sent 40 men to cover the exit from the cave and launched another assault along the ravine from the west, in single file owing to its narrowness, with crossbowmen alternating with soldiers bearing muskets, each with a companion sheltering him from arrows and stones with a shield. This tactic allowed the Spanish to break through the pass and storm the entrance of the city. The Poqomam warriors fell back in disorder in a chaotic retreat through the city, and were hunted down by the victorious conquistadors and their Mesoamerican allies. Those who managed to retreat down the neighbouring valley were ambushed by Spanish cavalry who had been posted to block the exit from the cave, the survivors were captured and brought back to the city. The siege had lasted more than a month and because of the defensive strength of the city, Alvarado ordered it to be burned and moved the inhabitants to the new colonial village of Mixco.