Pizarro's seizure of Cajamarca impressed me because it showed how materials (i.e. horses and guns) had indirect cultural implications (i.e. biological genocide) as they traveled through space. Thus, it was not the materials that caused cultural consequences, but the indirect repercussions of said materials' uses in certain spaces.
Additionally, I was amused by the Spaniards being surprised by their own victory because they assumed their superiority in military positioning and technology had brought about the end of their conquest. Instead of accurately depicting their military campaigns, European colonists asserted their dominance in historical writings.