Valmiki Ramayana Yuddha Kanda Sarga 131 Shloka 51

एवम् in that way, उक्ताःspoken, वारणोपमाः like mountain in form, गरुडाःइव like Garuda, शीघ्रगाःsped, महात्मानःgreat souls, वानराः Vanaras, शीघ्रम् quickly, गगनम् into the sky, उत्पेतुःrose up

Having spoken like that by Sugriva, the Vanaras of mountainlike forms fled like Garuda into the sky quickly.