Wikipedia Trail: Arjuna and Mahabharata

Some says that this whole Mahabharata was started to end this Yuga and start of new Yuga.  It was also that where ever god stand that side will win like Krishna standing by Arjuna and they won.

Arjuna was great archer and he know the best through out the continent and the only rival he had was his brother Karna.  Krishna trusted Arjuna the most and he will guide him through the battle and make sure that he wins.
Krishna had to pick side before Mahabharata happened but Duryodhana had two choice either to pick Krishna himself our his army and he picked his army.  Krishna became the charioteer for Arjuna because he said he would not pick up the weapon.
Duryodhana was really nice person but the one who wanted him to succedd the throne after his dad was his maternal uncle Shakuni and he told him many things to do and he did whatever his maternal uncle told him.  That is what led to Mahabharata.
Shakuni was exetremly intelligent but he used his brain to kill and poison others mind which lead to Mahabharata and that is where he died.  He was the brother of Duryodhana's mother and King of the Kingdom of Subala.

Krishna as charioteer and Aujana with bow.