The rely, when Rama was about to remove one of his eyes, Goddess Durga emerged and blessed him along with her divine 'shakti'. Rama received the fight on that day. मां ब्रह्मचारिणी (दूसरा दिन) द्वितीया तिथि On the main day, the goddess Shailaputri, the daughter with the mountains, is worshipped. https://www.youtube.com/watch?v=QIX0JZlLsgE