https://ourworldindata.org/conflict-deaths-breakdown - certainly has been in the millions - maybe lower in the 'Western world' but countless of the dead in wars across the world in ww2, have been civilians.

For example 3 to 5 million were killed in the 2nd Congo war of 1998-2003. https://en.wikipedia.org/wiki/List_of_wars_by_death_toll