Amba sought refuge with Parasurama, who ordered Bhishma to marry Amba, telling Bhishma it was his duty. Bhishma politely refused saying that he was ready to give up his life at the command of his teacher but not the promise that he had made. Upon the refusal, Parasurama called him for a fight at Kurukshetra. At the battlegrounds, while Bhishma was on a chariot, Parasurama was on foot. Bhishma requested Parasurama to also take a chariot and armor so that Bhishma would not have an unfair advantage. Parasurama blessed Bhishma with the power of divine vision and asked him to look again. When Bhishma looked at his guru with the divine eyesight, he saw the Earth as Parasurama’s chariot, the four Vedas as the horses, the Upanishads as the reins, Vayu (wind) as the Charioteer and the Vedic goddesses Gayatri, Savitri, and Saraswati as his armor. Bhishma got down from the chariot and sought the blessings of Parashurama to protect his dharma, along with permission to battle against his teacher. Pleased, Parashurama blessed him and advised him to protect his vow as Parasurama himself had to fight to uphold his word as given to Amba. They fought for 23 days without conclusion, each too powerful to defeat the other.