Amba reflected on her condition and considered all the people responsible for it, including herself (as she did not escape Bhishma's chariot when Bhishma was fighting Salva), Bhishma (who abducted her), Salva (who rejected her) and her father (who arranged her swayamvara).
She finally arrived at the conclusion that Bhishma was the main culprit and swore to destroy him by austerities or battle.
She sought shelter with a group of ascetics that night and narrated her tale to them.
There the learned sage Shaikhavatya consoled Amba and promised to guide her in her austerities.

Other sages discussed amongst themselves Amba's situation and contemplated her alternatives and advised her to return to her father as there are only two true protectors of a woman: a father and a husband.
However, Amba declined, deciding to practice austerities.
On the next day, the sage Hotravahana (of the Srinjaya race), a former king and Amba's maternal grandfather, passed by the place.
Upon listening to the tale of Amba's ordeal, the sage advised her not to return to her father and instead approach the sage Parashurama.
Akritavrana, one of Parashurama's disciples, also arrived at the place.
Hotravahana introduced Amba to Akritavrana and both of them explained Amba's ordeal to him.
Akritavrana gave Amba two options: either Parashurama should approach Salva to marry her or Bhishma should be defeated by Parashurama.
Amba asked Akritavrana to decide who was her culprit.
Akritavrana agreed with Amba that Bhishma was the root cause of her plight and should be the target of her revenge.
Akritavrana and Hotravahana explained Amba's predicament to Parashurama, whom Amba herself prayed to for help.
Parashurama gave his word to Amba that he would slay Bhishma, who was his disciple in the past, and destroy his pride.

When Parashurama arrived with his retinue at Kurukshetra and sent a message to Bhishma of his arrival, Bhishma came to see his guru, offering him the traditional respects.
A pleased Parashurama commanded Bhishma to accept Amba.
Bhishma refused, restating that he had taken a vow of celibacy.
An infuriated Parashurama threatened Bhishma with death.
Bhishma tried to calm the sage, but in vain, and he finally agreed to battle his guru to safeguard his Kshatriya duty.
Ganga tried stopping the battle by beseeching her son as well as the great sage, but failed.
The great battle lasted for 23 days, without any result.
On the 24th day when Bhishma chose to use a deadly weapon, at the behest of the divine sage Narada and the gods, Parashurama ended the conflict and the battle was declared a draw.
Parashurama narrated the events to Amba and told her to seek Bhishma's protection.
However, Amba refused to listen to Parashurama's advice and left angrily declaring that she would achieve her objective by asceticism.
Amba reflected on her condition and considered all the people responsible for it, including herself (as she did not escape Bhishma's chariot when Bhishma was fighting Salva), Bhishma (who abducted her), Salva (who rejected her) and her father (who arranged her swayamvara). She finally arrived at the conclusion that Bhishma was the main culprit and swore to destroy him by austerities or battle. She sought shelter with a group of ascetics that night and narrated her tale to them. There the learned sage Shaikhavatya consoled Amba and promised to guide her in her austerities.
Other sages discussed amongst themselves Amba's situation and contemplated her alternatives and advised her to return to her father as there are only two true protectors of a woman: a father and a husband. However, Amba declined, deciding to practice austerities. On the next day, the sage Hotravahana (of the Srinjaya race), a former king and Amba's maternal grandfather, passed by the place. Upon listening to the tale of Amba's ordeal, the sage advised her not to return to her father and instead approach the sage Parashurama. Akritavrana, one of Parashurama's disciples, also arrived at the place. Hotravahana introduced Amba to Akritavrana and both of them explained Amba's ordeal to him. Akritavrana gave Amba two options: either Parashurama should approach Salva to marry her or Bhishma should be defeated by Parashurama. Amba asked Akritavrana to decide who was her culprit. Akritavrana agreed with Amba that Bhishma was the root cause of her plight and should be the target of her revenge. Akritavrana and Hotravahana explained Amba's predicament to Parashurama, whom Amba herself prayed to for help. Parashurama gave his word to Amba that he would slay Bhishma, who was his disciple in the past, and destroy his pride.
When Parashurama arrived with his retinue at Kurukshetra and sent a message to Bhishma of his arrival, Bhishma came to see his guru, offering him the traditional respects. A pleased Parashurama commanded Bhishma to accept Amba. Bhishma refused, restating that he had taken a vow of celibacy. An infuriated Parashurama threatened Bhishma with death. Bhishma tried to calm the sage, but in vain, and he finally agreed to battle his guru to safeguard his Kshatriya duty. Ganga tried stopping the battle by beseeching her son as well as the great sage, but failed. The great battle lasted for 23 days, without any result. On the 24th day when Bhishma chose to use a deadly weapon, at the behest of the divine sage Narada and the gods, Parashurama ended the conflict and the battle was declared a draw. Parashurama narrated the events to Amba and told her to seek Bhishma's protection. However, Amba refused to listen to Parashurama's advice and left angrily declaring that she would achieve her objective by asceticism.
Amba (Mahabharata)