Here's some info on Bhishma's rage of war, Krishna's response to the same & what eventually led to Bhishma's death:
Day 4 of the War
The fourth-day of the battle was noted for the valour shown by Bhima. Bhishma commanded the Kaurava army to move on the offensive from the outset. While Abhimanyu was still in his mother's womb, Arjuna had taught Abhimanyu on how to break and enter the chakra vyuha. But, before explaining how to exit the chakra vyuha, Arjuna was interrupted by Krishna (other story: Abhimanyu's mother falls asleep while Arjuna was explaining her).Thus from birth, Abhimanyu only knew how to enter the Chakra vyuha but didn't know how to come out of it. When the Kauravas formed the chakra vyuha, Abhimanyu entered it but was surrounded and attacked by a number of Kaurava princes. Arjuna joined the fray in aid of Abhimanyu. Bhima appeared on the scene with his mace aloft and started attacking the Kauravas. Duryodhana sent a huge force of elephants at Bhima. When Bhima saw the mass of elephants approaching, he got down from his chariot and attacked them single handedly with his iron mace. They scattered and stampeded into the Kaurava forces killing many. Duryodhana ordered an all-out attack on Bhima. Bhima withstood all that was thrown at him and attacked Duryodhana's brothers, killing eight of them. Bhima was soon struck by an arrow on the chest and sat down in his chariot dazed.
Duryodhana was distraught at the loss of his brothers. Duryodhana, overwhelmed by sorrow at the loss of his brothers, went to Bhishma at the end of the fourth day of the battle, and asked his commander how could the Pandavas, facing a superior force against them, still prevail and win. Bhishma replied that the Pandavas had justice on their side and advised Duryodhana to seek peace.
Days 5-9 of The War
When the battle resumed on the fifth day, the slaughter continued. The Pandava army again suffered against Bhishma's attacks. Satyaki bore the brunt of Drona's attacks and soon could not withstand them. Bhima drove by and rescued Satyaki. Arjuna fought and killed thousands of soldiers sent by Duryodhana to attack him. The unimaginable carnage continued during the ensuing days of the battle. The sixth day was marked by a prodigious slaughter. Drona caused immeasurable loss of life on the Pandava side. The formations of both the armies were broken. On day 7 Drona slays Shankya son of Virata On the eighth day Bhima killed eight of Dhritarashtra's sons
On the ninth day Krishna, overwhelmed by anger at the apparent inability of Arjuna to defeat Bhishma, rushed towards the Kaurava commander, The wheel of a fallen chariot in his hands. Bhishma lays down his arms and is ready to die at the hands of the Lord, but Arjuna stops Him, reminding of His promise not to wield a weapon. Realizing that the war could not be won as long as Bhishma were standing, Krishna suggested the strategy of placing a eunuch in the field to face him. Some sources however state that it was Yudhistira who visits Bishma's camp at night asking him for help. To this Bhishma says that he would not fight a eunuch.
Day 10 of the War
On the tenth day the Pandavas, unable to withstand Bhishma's prowess, decided to put Shikhandi, who had been a woman in a prior life in front of Bhishma, as Bhishma has taken a vow not to attack a woman. Shikhandi's arrows fell on Bhishma without hindrance. Arjuna positioned himself behind Shikhandi, protecting himself from Bhishma's attack, and aimed his arrows at the weak points in Bhishma's armour. Soon, with arrows sticking from every part of his body, the great warrior fell from his chariot. His body did not touch the ground as it was held aloft by the arrows protruding from his body.
The Kauravas and Pandavas gathered around Bhishma and, at his request, Arjuna placed three arrows under Bhisma's head to support it. Bhishma had promised his father, King Shantanu that he would live until Hastinapur were secured from all directions. To keep this promise, Bhishma used the boon of "Ichcha Mrityu" (self wished death) given to him by his father. After the war was over, when Hastinapur had become safe from all sides and after giving lessons on politics and Vishnu Sahasranama to the Pandavas, Bhishma died on the first day of Uttarayana.
Udne Ki Aasha
Anupamaa
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