Mahabharata Bhishma Parva Chapter 99:3

Mahabharata Bhishma Parva (Bhagavat-Gita Parva) Chapter 99:3 Therefore, with my whole soul I think that protecting the son of Ganga is our foremost duty. The very wolf may slay the lion left unprotected in the great forest. Let not Ganga's son be slain by Sikhandin like the lion slain by the wolf. Let our maternal uncle Sakuni, and Salya, and Kripa, and Drona, and Vivinsati, carefully protect the son of Ganga. If he is protected, (our) victory is certain. Hearing these words of Duryodhana, all surrounded Ganga's son with a large division of cars. And thy sons also, taking up their position around Bhishma, proceeded to battle. And they all went, shaking the earth and the welkin, and causing fear in the hearts of the Pandavas. The mighty car-warriors (of the Kaurava army), supported by those cars and elephants, and clad in mail, stood in battle, surrounding Bhishma. And all of them took up their positions for protecting that mighty car-warrior like the celestials in the battle between themselves and the Asuras for protecting the wielder of the thunder-bolt. Then king Duryodhana once more addressing his brother, said, 'Yudhamanyu protects the left wheel of Arjuna's car, and Uttamaujas his right wheel. And (thus protected) Arjuna protects Sikhandin. O Dussasana, adopt such steps that, protected by Partha, Sikhandin may not be able to slay Bhishma left unprotected by us.' Hearing these words of his brother, thy son Dussasana, accompanied by the troops, advanced for battle, placing Bhishma in the van. Beholding Bhishma (thus surrounded by a large number of cars), Arjuna, that foremost of car-warriors, addressed Dhrishtadyumna and said, 'O prince, place that tiger among men, Sikhandin, today in front of Bhishma. I myself will be his protector, O prince of Panchala.