I’m curious about which battle in World History had the most deaths or casualties.
To limit it further, perhaps we could talk about single day casualties. Major battles in the two World Wars went on for weeks and even months.
My picks for long battles: The Ukraine Campaign. The Battle of Moscow, The Battle of Lenningrad (if we include civilian casualties), Kusk, and The Somme.
My picks for single day: The first day of the Somme (56,000 British casualties, I don’t know how many German), Hiroshima (if we count civilians), Borodino (74,000). I don’t know if any single day WWII battle on the Eastern Front (maybe during the battle for Kiev) can compete. Nor do I have any idea if any ancient or Medieval Battles are close. The First Crusaders slaughtereed 30,000 (or something like that) infidels in Jerusalem, but that’s a little different that battle casualties.