As SOON as the news of the slaying of Sisupala by Krishna reached his friend Salva, he became very angry and besieged Dwaraka with a mighty force. Krishna having not yet returned to Dwaraka, old Ugrasena was in charge of the defence of the city. The sieges described in the Mahabharata seem very much like those in wars of the present day. Dwaraka was a strongly garrisoned fortress built on an island and well provided with means of defence. Ample barracks had been provided and there was an abundant supply of food and weapons and the garrison included many illustrious warriors. Ugrasena imposed a stringent ban upon drinking and amusements generally for the period of the siege. All the bridges were demolished and ships were forbidd enentry into ports in the realm. Iron spikes were planted in the moats around the fortress and the city walls kept in good repair. All entrances to the city were guarded with barbed wire and permits and passwords strictly controlled ingress and egress. Thus no arrangements were neglected that could further strengthen the city which nature had already made impregnable.