Fourth day to Tenth Day
The fourth day of the war saw Bhishma in great mood of valour and bravery. The Pandava army was in great disarray due to unimaginable destruction inflicted by the Kaurava Army under the leadership of Bhishma. Even Bhima was hurt at the hands of Duryodhana. This continued for five days more with no victory in sight for either army. And hence the 'think-tank' of Pandavas met and decided to put an end to Bhishma's supremacy somehow. Bhishma although old, was proving a great hurdle in the victory of Pandavas. Arjuna was not ready to fight with him with full vigour. Therefore, it was suggested to bring Shikhandi in picture. As Bhishma had vowed not fight with that eunuch, Arjuna could hit the old man under the cover. It was so decided.
The Great Bhishma Collapses
The battle of tenth day began. Shikhandi was in the front attacking Bhishma. Bhishma however, said, "Get away, O Shikhandi, I do not want to fight with you." Thus the mighty and powerful Bhishma laid down his arms. The arrows from Arjuna's Gandiva penetrated his body. Bhishma fell down. There were so many arrows in his body that when he fell down he was as if lying on the bed of arrows! His head was hanging, which Arjuna supported by three arrows under the head and neck. As is well known Bhishma had the boon to give up his body as and when he decided. The sun was in southern hemisphere, this time. and it was not very auspicious to give up body in this phase of sun movement. Therefore, Bhishma said to Sri Krishna, "O Vallabha, Please take me far off corner of the battle ground after about a fortnight when enters to move in northern hemisphere I would give up the body." Thus was arranged a safe and peaceful shelter for this grand old Kuru.
Sri Krishna suggested Yudhisthira to take lessons on politics, diplomacy, duties of a king, economics, and many other related subjects from dying Bhishma. Accordingly every day after the day's battle was over, Yudhisthira and others would visit Bhishma and take lessons on various topics of art and culture at his holy feet. This is a very thought provoking chapter of Mahabharata.
Then enters the character of mighty and skillful Karna as Bhishma is no more in the lead. Dronacharya next becomes the commander of Kauravas army. The Teacher of Pandavas and Kauravas was equally difficult to dislodge as was Bhishma.