Israel is the trinity within, Isis the spirit, Ra the mind, El the god in the human, and Midian is strife, the contention and fear that trouble a person from below. The captives taken are sorted by polarity in the verses that follow: the little ones and the men are new thoughts of the lower mind marked to be killed, while the women untouched by any man are the pure spirit of God to be kept.
The cattle and flocks and goods are the yield of that lower ground, but the slaughter surrounding this scene is the point. The mind of strife is purged so the untouched spirit can be freed, not gathered up as comfortable loot.
Midian: strife, the fear and contention that trouble a person from the lower nature
Women of Midian: the spirit produced within, later split into the pure part kept and the polluted part destroyed
Little ones: new thoughts born of the lower mind, marked to be killed
Cattle and flocks and goods: the produce of the lower ground, the raw energies of the mind of strife