The kaurava supremo Dronacharya planned to divert Arjuna and Krishna away to chase an army of the samsaptakhas whom Arjuna defeated that very day. The Kaurava army was grouped into the giant discus formation, which caused great loss for the pandavas. If the formation continued till end of that day, the pandavas would have no army by sunset. The only 2 people on the pandava army who completely knew about how to enter and break this formation were Arjuna and Krishna, who were away. Hence, without option, all other pandava generals turned to Abhimanyu, Arjuna’s son. Abhimanyu’s story came to prominence when he entered the powerful Chakravyuha battle formation of the Kaurava army, Abhimanyu claimed that he could decimate the entire kaurava and pandava army in a fair combat. Abhimanyu was trained in all types of warfare by Lord Krishna and Arjuna themselves, and later by pradyumna (sri krishna’s son). Abhimanyu learnt the art of breaking into the chakravyuha when he was in subhadra’s womb, It was when arjuna was narrating the art of breaking into chakravyuh to Subhadra. But he did not know how to destroy the formation once he was inside, as krishna had stopped the conversation and taken away arjuna.