The Inca Pachacutec being absorbed with his works in Cuzco, no longer had time to continue with his expeditions. Owing to this and in view of the fact that his children were still small, he entrusted his brother Capac Yupanqui to head to the coast, to the prosperous señorío of Chincha.

There is a report of this first encounter of the people from Chincha since it was a recognition, an attempt to establish a friendly relationship instead of a conquest. Arriving in Chincha, Capac Yupanqui showed he did not want anything more than the acceptance of Cuzco superiority and heaped gifts on the curacas of Chincha to demonstrate Inca magnificence. The coastal people had no problem recognizing the Inca and continued peacefully in their domain.

The prosperity of these coastal people was due to long distance exchanges which they carried out by sea in rafts with the north, which is now Ecuador. In addition, these "Indian-style merchants" maintained overland exchanges with herds of camelids with the Collao and Cuzco.

It is only afterwards, during the reign of Tupac Yupanqui, that true territorial annexation was produced.

The second departure of General Capac Yupanqui

Some time after the expedition to the coast, the Inca reunited his armies so that General Capac Yupanqui was on his way to conquest along the Chinchaysuyu road, through the mountains.

Near Guamanga, the natives of the region of Parcos took refuge in the fortress of Urco Collac and offered resistance. Among the troops under the command of Capac Yupanqui was a Chanca chief called Anco Ayllo, who commanded a group of that nation. Under his orders, the Chancas assaulted the rebel fort with such good luck that they seized it.

The news infuriated Pachacutec because he found that a Chanca triumph diminished the "Long-eared" nobles from Cuzco and he sent a message to Capac Yupanqui with the order to exterminate all the Chancas. However, the notice was heard by one of the general's concubines, who was the sister of Anco Ayllu. The woman warned of the Cuzco intentions and the Chanca chief decided to flee with his troops to the region of the jungle that would protect his band of men.

At that time they found themselves in the mountains of Huanuco and at night the Chancas broke camp in silence and headed toward the warm zone of rupa rupa. When their departure was discovered, the Inca general pursued them but without success. Then Capac Yupanqui continued his march through the mountains reaching Cajamarca far from the limits set by Pachacutec.

In that place Gusmango Capac governed and on that occasion he allied himself with the Chimu and together they awaited the appearance of the Inca armies. Despite their number, Capac Yupanqui defeated them and obtained a fabulous booty which astonished the people from Cuzco and was spread out in the plaza in Cajamarca. It would seem the general was vainglorious for having gotten more treasures than his brother, the Inca.

Only then, Capac Yupanqui took the road to return to Cuzco with his acquisitions. When he was in Limatambo, messengers arrived from the Inca ordering the detention of the general and the death sentence for the escape of the Chancas. According to tradition, the triumph of Capac Yupanqui made him able and competent, a fact which cast a shadow on the sovereign who feared that he would rise up against him.