On the thirteenth day of the battle, Drona arranged his forces in the Chakra Vyuha ( or Wheel) formation. Only Arjun knew the secret technique to penetrate the Chakra Vyuha. With Arjun far away fighting the Samsaptaks, the Pandavas were in trouble. Abhimanyu, the teenage son of Arjun, told his uncles that he knew how to break open and enter the Chakra Vyuha but he didn't know the technique to… 