Piles of hundreds of sling stones lining the interior of defensive walls can still be found at various Inca forts, such as Cerro del Inga, Chile (Planella et al. 1991: 407). Soldiers often wore quilted cloth armor that was so effective against Andean weapons that many Spaniards discarded their own metal plate in favor of the lighter protection. Warriors also frequently carried shields and protected their chests and backs with plates of metal and their heads with cane helmets.