[areyousure]

> more than twice that amount [10,000] died in one day on September 17, 1862.

In case anyone is curious, this refers to "the bloodiest day in all of American history" https://en.wikipedia.org/wiki/Battle_of_Antietam where it appears fewer than 8,000 people died.

[googlryas]

Oops, I mistook the casualty figure for the total deaths. In any case, even if "only" 3500 people died in 1 day, that is still a rate approximately 4000x higher than the average rate over the past 20 years.