The thread supposition is that the men tucked the women away and then went off to war. My counterpoint is that what evidence we have of the ancient world (more than 3k years ago and such since the people in the replies vaguely talk about tribes) doesn't really indicate that people "went off to war" like that, nor that what conflict did happen didn't have women in it.

There's also the issue that if we're talking mass graves > 5k years ago, so from sites from cultures about which we know very little, it's very difficult to accurately determine and individual's biological sex, and essentially impossible to determine their gender (knowing nothing about the genders of that society). https://onlinelibrary.wiley.com/doi/10.1155/2015/908535

If you're of the persuasion that modern gender enthusiasm is stupid or whatever, that's irrelevant, we're discussing ancient cultures, and other cultures clearly have had more than 2 genders before so we need to acknowledge the possibility https://www.pbs.org/independentlens/content/two-spirits_map-...

So: which grave sites did you mean? The oldest one we know of, Jebel Seheba, may have been from a protracted series of conflicts and is about half half male / female for the skeletons for which sex can be reasonably determined. The Talheim death pit had women in it. The crow creek massacre site had women in it.