Kansa heard of these exploits of the young lads and tried to send an elephant in rut, but it was the elephant that was killed. Next Kansa had two of his best wrestlers challenged them in combat. The wrestlers met with their end and realised that the Divine had come in the form of Krishna and Balarama. Then Kansa ordered his troops close in on them. But, Krishna, in a trice, jumped on the platform where Kansa was seated and rained severe blows on him till he dropped dead.
After the death of Kansa, Krishna and Balarama went to the prison where Devaki and Vasudeva were confined, freed them. Krishna reinstated Kansa's father on the throne.
Later, Krishna went to Akrura's house. Akrura referred to the inexplicable ways of the Lord in His various incarnations and said that he was greatly blessed by Krishna's visit to his house. He hugged Krishna, who was well aware of Akrura's boundless devotion." Sai Baba, SS, 7/95, p. 186
Establishment Of Dwaraka
"After (completion of their education at sage Sandeepani's ashram) Krishna and Balarama returned to their kingdom from the forest. Jarasandha, the ruler of Magadha, who had given both his daughters in marriage to Kansa, and bore grudge against Krishna, invaded the Yadava kingdom and caused considerable destruction. Krishna strategy was to weaken Jarasandha after each encounter and finally destroy him. The followers of Jarasandha harboured hatred towards Balarama and Krishna and were harassing the Yadavas during Yajnas. Krishna wanted to settle his people in a secure place. He had an inland city constructed by Vishwakarma, the architect of the gods. That city was Dwaraka, a city of unmatched splendour and beauty. The Yadavas began to lead happy lives in the new place " Sai Baba, SS, 7/95, p. 188