Bhagavad Gita Chapter 1.12
tasya sañjanayan harṣaḿ
kuru-vṛddhaḥ pitāmahaḥ
siḿha-nādaḿ vinadyoccaiḥ
śańkhaḿ dadhmau pratāpavān
Translation
Then Bhishma, the great valiant grandsire of the Kuru dynasty, the grandfather of the fighters, blew his conchshell very loudly, making a sound like the roar of a lion, giving Duryodhana joy.