Bhishma says,
Krishna gets out of his chariot, his shield torn, blood dripping, sweat on his face stuck with disheveled hair, covered with dust, while driving the chariot, with the Sudarshana discus in his hand, gets down to kill me. What a sight it was... Krishna doesn't even realise that his uttariyam(uppper garment) has flown away.
Let such Mukunda (giver of supreme bliss) be always in my heart.

Bheeshma further says,
Krishna broke his vow, which is more precious than the vedas,
to render true Bhishma's vow, that he(bhishma) would force Krishna take up his arms.