Valmiki Ramayana Yuddha Kanda Sarga 34 Shloka 27

एतस्मिन् अन्तरे in the meantime from inside, वानरसैन्यानाम् Vanara troops, भेरीशङ्खसमाकुलः sounds of drums and conches, धरणीतलम् earth surface, कम्पयन् shaking, शब्दः sound, श्रुतोवै was heard.

In the meantime (while Saarana was telling Sita) the sounds of drums and conchs combined with the clamour of Vanara troops was heard and it was as though the surface of the earth was shaking.