SB 10.68.13
tac chrutva naradoktena
rajan sañjata-manyavah
kurun praty udyamam cakrur
ugrasena-pracoditah
Translation:
O King, when the Yadavas heard news of this from Sri Narada, they became angry. Urged on by King Ugrasena, they prepared for war against the Kurus.
Purport:
Srila Prabhupada writes: “The great sage Narada immediately carried the news to the Yadu dynasty that Samba was arrested and told them the whole story. The members of the Yadu dynasty became very angry at Samba's being arrested, and improperly so by six warriors. Now, with the permission of the head of the Yadu dynasty's king, Ugrasena, they prepared to attack the capital city of the Kuru dynasty.”