Śrīmad-Bhāgavatam 10.59.5
Blended reading (Sanskrit + English inline)
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śaṅkha
—
conchshell
One of Viṣṇu's four insignia. The conch is born of the ocean — śabda-brahman taking auspicious form. Its sound is considered itself a deity; hearing it is held to cleanse.
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yantrāṇi
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mystic talismans, magical contrivances
From √yantr (to restrain). Bhauma's fortress is sealed with yantras — mantra-charged devices. Kṛṣṇa's nāda-yantra (the conch) breaks the asura's yantras; transcendent sound dissolves material technology.
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hṛdayāni
—
the hearts
The verse's most pointed word: the same blow cracks ramparts and chests. Gauḍīyas read it as a hint that the Lord's sound enters where stone cannot — He is antaryāmin even in battle.
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gadādharaḥ
—
the holder of the club
One of Viṣṇu's thousand names (Viṣṇu-sahasranāma); also Caitanya Mahāprabhu's intimate associate Gadādhara Paṇḍita bears this name. The epithet keeps Bhagavān's aiśvarya in view even as the action continues.
He pierced the hearts of the warriors which were like hard barriers, with sound of his conch.
The walls had machines attached. When struck by the foot they would release weapons at the oncoming soldiers. They were situated on top of the walls, operating on their own. Kṛṣṇa destroyed them. The loud sound of his conch also shattered the hearts of the enemy warriors because of its natural wavering quality. The walls were thick but he easily destroyed them because he was skilful at using his club. For that reason he attained the name Gadādhara.
The machines were placed on the fortress and threw balls of iron with special herbs. The sound of the conch shattered the machines and the hearts of the defenders. The heavy club destroyed the heavy walls. He did not take effort to destroy these walls because he did it simply by holding the club in his hand.
A king's conch announces him before the king is seen; the sound itself reorganizes the room. Kṛṣṇa's Pāñcajanya is no announcement — it is the weapon. The brave defenders' hearts crack along with the magic seals, because in His presence the inside and outside of a fortress share the same fragility.
On the morning of the great war, Kṛṣṇa blew Pāñcajanya — and the Mahābhārata records that the sound made the Kaurava army's hearts sink. Sañjaya reports it to Dhṛtarāṣṭra in the opening of the Gītā (BG 1.14, 1.19).
The same conch is at work here: the sound that shakes Kaurava courage shatters Bhauma's seals. Gauḍīyas read Pāñcajanya as the audible form of the Lord's authority — śabda that does what it names.
My note
Source: vedabase.io