Chakravyuha

(“circular phalanx”) A circular military
formation described in the Mahabharata,
one of the two great Hindu epics (along
with the Ramayana). The Chakravyuha
was widely believed to be unconquerable because each person in the formation was protected by those behind
him. During a battle in the Mahabharata
war, Abhimanyu becomes trapped in
the chakravyuha by his enemy. Because
his father, Arjuna, is the only person
who knows how to get out, Abhimanyu
is killed.