SB 10.66.21
iti ksiptva sitair banair
virathi-krtya paundrakam
siro ’vrscad rathangena
vajrenendro yatha gireh
Translation:
Having thus derided Paundraka, Lord Krsna destroyed his chariot with His sharp arrows. The Lord then cut off his head with the Sudarsana disc, just as Lord Indra lops off a mountain peak with his thunderbolt weapon.