Kṛṣṇa was obliged to take up a chariot wheel and attack Bhīṣma

Instagram: Srila Prabhupada: Kṛṣṇa promised not to fight in the Battle of Kurukṣetra, but Bhīṣma, in order to break Kṛṣṇa’s promise, attacked Arjuna in such a vigorous way that Kṛṣṇa was obliged to take up a chariot wheel and attack Bhīṣma. The Lord did this to show that His devotee was being maintained at the sacrifice of His own promise. CC Madhya 10.175