Child, a daughter of my brother, that is chucked out in pre-battle steps (3,5)
I believe the answer is:
war dance
But I can't explain it at all! Could you help me understand?
(Other definitions for war dance that I've seen before include "Steps taken by fighters" , "moves anticipating conflict?" , "Pre-battle ceremony" , "steps taken before engagement" , "Tribal ceremony before battle" .)