I mean, when hundred and eighty men conquer millions you have to wonder. Surely there must have been a way for Incas to crush them.

You can frame the Cuban Revolution as 84 guys on a boat conquering millions. What’s the error here? “But hadn’t the Batista govt. heard about the concept of sinking boats?” Or is the framing off?

Well yes, I can certainly imagine Batista's troops and especially intelligence being more competent in a parallel universe.