Don't forget horses, armor, and steel weapons. It seems like Incan weapons had a lot of trouble penetrating Spanish armor, while the reverse was not true. Also, the Incas didn't just lack cavalry; they lacked the weapons and tactics to counter cavalry (such as pike formations.)

That said, I was thinking of the Battle of Cajamarca, which was actually a Spanish ambush. 100x was probably overstating it; under other circumstances (e.g. rough terrain) Spanish technology had less of an edge.