ततः शङ्खाश्च भेर्यश्च पणवानकगोमुखाः ।सहसैवाभ्यहन्यन्त स शब्दस्तुमुलोऽभवत् ॥
tataḥ śaṅkhāśca bheryaśca paṇavānakagomukhāḥ |sahasaivābhyahanyanta sa śabdastumulo'bhavat ||
Then conches, kettledrums, tabors, drums and cow-horns all sounded at once, and the noise was tumultuous.
Explanation
Sanjaya is describing the battlefield of Kurukshetra to the blind king Dhritarashtra. After Bhishma, the eldest of the Kurus, blows his conch, the whole Kaurava army joins in with conches and war instruments (horns, drums and kettledrums). The result is a deafening roar that marks the start of the war.