What convinced Inca armies to retreat in their war against the Spanish in 1533? The Spanish captured their emperor.
The Spanish executed their emperor.
The Spanish captured their capital city.
The Spanish joined forces with native groups.

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.

He's too busy doing aaa games to be doing anime.

Ithink its trade and commernce let me know if im wrong