After defeating Kansa, Krishna and Yadavas settled down
peacefully in Mathura .
But Jarasandha who was the father-in-law of Kansa did not accept Krishna . He decided to avenge the death of Kansa.
Jarasandha ordered his army to attack Mathura . He wanted Mathura to be razed down and burnt. But
Krishna and Balarama defended Mathura
against the assault.
Jarasandha attacked Mathura
17 times. Krishna and Balrama defended their
kingdom each time.
Jarasandha was preparing to attack Mathura 18th time. Krishna
learnt that the army of Jarasandha this time will be led by Kalayavan. As per destiny, this
commander was destined to destroy Mathura .
Krishna who realized this asked all the people of Mathura to follow Him. From Mathura, Krishna and his followers moved towards west and made their kingdom in Dwarka – an island. As Dwarka was protected by sea on
all sides, Jarasandha could no longer attack the kingdom.