Chapter1:13
tataḥ śaṅkhāśca bheryaścapaṇavānakagomukhāḥsahasaivābhyahanyantasa shabdastumulo ‘bhavat
 The Kaurava army eager and restless  began to blow their conch shells, drums, and trumpets. The noise was thunderous and filled the sky, symbolizing the start of battle and the display of might and aggression by Duryodhana’s forces.This hints at the restlessness of the Kaurava side, driven by ego and fear, unlike the calm, composed confidence of the Pandavas .This outer war scene represents the inner war of the mind — the conflict between our higher self (the soul guided by dharma) and our lower impulses (ego, anger, attachment, and fear).The loud, chaotic sound from the Kaurava side symbolizes the noise of the mind when we are driven by ego, competition, and anxiety.When negative emotions dominate, our inner world becomes loud — full of opinions, judgments, and fears — leaving little room for peace or wisdom. Just as the Kauravas made a great noise to appear powerful, the ego too makes mental “noise” to hide its insecurity.