Moving Robe Woman heard that her brother was dead.

What happened next is recorded in multiple accounts by Lakota and Cheyenne warriors who were present.

She dressed for battle.

She let down her hair — a gesture that in Lakota culture signaled mourning, grief turned outward, the transformation of loss into action.

She took up a weapon or a coup stick.

She mounted her horse.

And she rode into the battle.

Her own later account, recorded in interviews conducted years after the battle, described her state of mind in terms of grief and fury combined — not the calculated decision of a professional warrior, but the immediate, overwhelming response of a sister who had learned that her brother, her family, had been killed.