SB 4.10.8
sa tan apatato vira
ugra-dhanva maha-rathah
ekaikam yugapat sarvan
ahan banais tribhis tribhih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Dhruva Maharaja, who was a great charioteer and certainly a great bowman also, immediately began to kill them by simultaneously discharging arrows three at a time.