I once read an exstensive record of the wars between the "Conquistadores" and the Inca.
It was written by several Spanish friars who accompanied the soldiers..the detail is astounding.
The Inca soldiers were in disarray from the outset..after their leader was betrayed and murdered.
The Inca had several battlefield successes..mostly when the "Spanish" were not on horseback.
In one instance they trapped a large garrison and set the dwelling on fire..most were killed.
The Spanish recognized the "Supersticious" patterns of the Inca..and exploited it...as leaders fell..the remnants scattered..and wound up in mountain "Redoubts"..like "Vilicabamba".
The last stand was designed to keep the Spanish from ever finding "Machu Picchu"...the Spanish failed at several attempts..but eventually broke inside the main temple area..killing the leader...the Inca nation fell in resistance..as the scattered could not obtain leadership to continue.
The Inca were learning as they went..they eventually learned to not fear the horses..pikes..like something from Englands civil war period were used..and were successful...but in hand to hand fighting..the sword and minor armor prevailed...the Inca were not able to co-ordinate well..in battles..they outnumbered the Spanish 20-40 to 1..yet lost.
There is a reference that the Inca allready forsaw their fall..this came via "Astronomy" and Preist leadership...the Inca fought..but not in a unified mindset..too many believed the Prophecies..by the time of the "Vilicabamba" redoubt..too few remained..to turn the tide.
Wow...thank you for posting.