Mahabharata 7.13.17

श्रुत्वा शड्खस्य निर्घोषं पाण्डवस्य महौजस: । त्वदीयेष्वप्यनीकेषु वादित्राण्यभिजषध्निरे

śrutvā śaṅkhasya nirghoṣaṃ pāṇḍavasya mahaujasaḥ | tvadīyeṣv apy anīkeṣu vāditrāṇy abhijaṣadhnire | āptair āśu parijñātaṃ bhāradvāja-cikīrṣitam ||

Sañjaya said: O King, hearing the thunderous blast of the mighty Pāṇḍava’s conch, instruments were sounded even among your own divisions. And through trusted agents it was swiftly learned what the son of Bharadvāja (Droṇa) intended to do.