Sounds to me like slavery. The women slaves had babies, the male slaves were workers and soldiers. In a way, it sort of sounds like a eusocial sort of society

Sounds to me like slavery. The women slaves had babies, the male slaves were workers and soldiers. In a way, it sort of sounds like a eusocial sort of society, like a bee colony (but with the male female roles reversed). One reproducing male, many reproducing females, many non-reproducing males.