The Kurukshetra war · Mahabharata questions
What is the chakravyuha?
The chakravyuha is a battle formation shaped like a spinning discus or a coiled maze, with layered rings of troops that close behind anyone who enters. Drona used it on the thirteenth day at Kurukshetra, and Abhimanyu, who could enter but not leave it, was killed inside.
A vyuha is a battle array, and the epic names many: the eagle, the crane, the crescent, the needle, the ocean. The chakravyuha, the wheel or discus array, is the most famous because of what happened inside it. Troops are arranged in concentric rings that rotate, with a spiral corridor inward held at each turn by a champion, so that a warrior who forces his way in finds the path closing behind him and a fresh opponent at every layer. It is designed to swallow rather than to block.
Breaking one requires knowing the sequence of the rings and the technique for reversing it. On the thirteenth day of the war Drona chooses this formation precisely because so few of the enemy know that technique, and he chooses the day on which Arjuna has been lured away to the southern edge of the field.
Abhimanyu had learnt the entry while still in the womb, listening to Arjuna explain it to his mother Subhadra; she fell asleep before Arjuna described the way out, and so the knowledge stopped half-taught. That story is the reason the formation carries so much weight in the tradition. The boy opens the array, the Pandavas following him are shut out by Jayadratha, and he is killed inside it by many warriors at once.
Outside the epic the chakravyuha has become a standing metaphor in Indian usage for a trap easy to enter and impossible to leave, applied to debt, to bureaucracy, to politics. The metaphor is exact: the danger is not the wall but the closing.