Valmiki Ramayana Yuddha Kanda Sarga 94 Shloka 21
Original Shlokaचालयन्तंमहासैन्यंविधमन्तंमहारथान् । ददृशुस्ते न वैरामंवातंवनगतंयथा ।।6.94.21।।
1 source checked for this shloka
ते those, महासैन्यम् great army, चालयन्तम् moving, महारथान् huge chariots, विधमन्तम् breaking, रामम् Rama, वनगतम् blowing in the forest, वातंयथा wind like, न ददृशुः not see
They could not see Rama while he was moving and breaking huge chariots as one would not be able to see the trees in the forest when the wind blew fast.