SB 4.10.7
tato niskramya balina
upadeva-maha-bhatah
asahantas tan-ninadam
abhipetur udayudhah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O hero Vidura, the greatly powerful heroes of the Yaksas, unable to tolerate the resounding vibration of the conchshell of Dhruva Maharaja, came forth from their city with weapons and attacked Dhruva.