... sacrifices to the deities. Nevertheless he ordered his captains to fortify the strategic points and make preparations for defense. The invaders may have come from Argentina. It is possible that they were spurred on by hunger and famine caused by the gradual exhaustion of forested areas and the subsequent spread of untillable grasslands on the great pampas. Montesinos indicates that many of the people who came up into the highlands at that time were seeking arable lands for their crops and were "fleeing from a race of giants"—possibly Patagonians or Araucanians—who ... — Inca Land - Explorations in the Highlands of Peru • Hiram Bingham
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