Cortés conquered the Aztec Empire, then home to about six million people, in two and a half years with a few hundred men.

“Cortez takes over the Aztec Empire in what is now Mexico in two and a half years, so a couple hundred men.”

“an empire of six million people two and a half years uh pizarro does the same thing for the inca empire 10 years later in about five years so it's insane how fast these conquests happened um and just how little time that the even though in principle they could have figured out ways in which to combat cavalry and things just how little time they had to adapt all the while their whole social structure is disintegrating there's disease etc there's all this like psychological shock”