>>95975701
If you put a bunch of women on horses and give them a bows, they are going to be able to defeat an all male infantry force.
The real problem with an all female military in a pre-industrial setting is that women of military age are also of baby-making age, and they can't do both at the same time. So you need to come up with some bullshit for how their society keeps growing without their young women producing multiple babies, especially if infant mortality rates are realistic.