ta vajra-kalpa hy abhavan

 parigha mustina bhrtah

jaghnur dvisas taih krsnena

 varyamanas tu tam ca te

 

Translation: 

 

As soon as they took these cane stalks in their fists, the stalks changed into iron rods as hard as thunderbolts. With these weapons the warriors began attacking one another again and again, and when Lord Krsna tried to stop them they attacked Him as well.