ago. From the last range of the Andes, on the east side of the Paucartampu river, the descent is rapid into the montaña, as the tropical forests are called by the Spaniards. The forests were very scantily inhabited by wild Indians who wandered about, some in canoes as fishermen, some hunting with bows and arrows or the pucuna (blowpipe). A few had some affinity with the people of the Andes, but the great majority of the Amazonian tribes were of a different race.
The subjugation of the parts of the montaña nearest to the foot of the Andes was a matter of great importance to the Incas. In the tropical valleys the coca plantations were formed and every Peruvian chewed coca. From the montaña also came supplies of bamboo, of wood of the chonta palm for their weapons, other timber for building, plumes for head-dresses, and the principal supplies of gold.
The campaign of Tupac Inca Yupanqui for the conquest of Anti-suyu was, like all his warlike operations, masterly in design and bold in execution. The long valley of Paucartambo, at the foot of the last ridge of the Andes, formed a convenient base where the three columns, forming the army of Anti-suyu, was to assemble. The Inca himself started from a place in the valley called Ahua-tuna, descending into the forest by the lovely ravine of the Chiri-mayu. The central column under Prince Uturuncu Achachi, the Inca's brother, was at a place called Amaru, the modern town of Paucartampu.
