Rigved Verse 1.133 mentions this curious story:
WITH sacrifice I purge both earth and heaven: I burn up great she-fiends who serve not Indra, Where throttled by thy hand the foes were slaughtered, and in the pit of death lay pierced and mangled.
O thou who castest forth the stones crushing the sorceresses’ heads, Break them with thy wide-spreading foot, with thy wide-spreading mighty foot.
Do thou, O Maghavan, beat off these sorceresses' daring strength. Cast them within the narrow pit. within the deep and narrow pit.
My question is who were these she-fiends or sorceresses? Is this event mentioned in any other scripture in detail?