As Ukraine struggles against Russian assaults and its losses mount, there has been a surge of women enlisting, and they are increasingly volunteering for combat roles. On the front line just outside Bakhmut, Ukraine, a 32-year-old commander of a Ukrainian artillery platoon rocked to and fro in the passenger seat of a beat-up Lada, as another soldier navigated the car through a thick forest, sometimes mowing down young trees. When they reached their destination, a small village less than two miles from Russian lines, all that was left were destroyed houses, their shattered roofs visible in the moonlight. The commander,...