First of all, you clearly do not know what constitutes genocide.
genocide -the
deliberate killing of a large number of people from a particular nation or ethnic group with the aim of
destroying that nation or group
It's not a case of "umm, actually they needed to kill 500,000 more in order to be placed on the genocide list"
And the only battles from WW2 with million plus casualties were actually sieges, where, get this, civilians would make up the bulk of the casualites