200 years ago world population was 1/10th what it is today making most events more common now. Something like 5% of everyone ever born is alive right now.

In terms of most kills by a single person one sniper is credited with ~700 kills and a mounted knight in plate was expedition to equal 100 peasants on average so 200+ in exceptional cases seems reasonable especially considering the Spanish conquest of South America where in the 1500's where ~300,000 vs 2000 and the 2000 won with minimal casualties. https://en.m.wikipedia.org/wiki/Spanish_conquest_of_the_Inca...