Valmiki Ramayana Yuddha Kanda Sarga 55 Shloka 14

द्रुमशैलप्रहाराणाम् trees and hillocks in hand, वानराणाम् Vanaras, महाचमूः huge troops, योद्धुम् for the combat, समुपतिष्ठतं stood prepared, तेनशब्देन by that noise, वित्रस्ता expanded.

Huge troops of Vanaras holding trees and hillocks stood prepared for waging and by that the noise that arose expanded.