Srimad Bhagavatam Canto 10, Chapter 59, Text 05

SB 10.59.5

sankha-nadena yantrani
 hrdayani manasvinam
prakaram gadaya gurvya
 nirbibheda gadadharah
 
Translation: 
 
With the sound of His conchshell Lord Gadadhara then shattered the magic seals of the fortress, along with the hearts of its brave defenders, and with His heavy club He demolished the surrounding earthen ramparts.
Srimad Bhagavatam Canto 10, Chapter 59, Text 04
Srimad Bhagavatam Canto 10, Chapter 59, Text 06