Valmiki Ramayana Sundara Kanda Sarga 46 Shloka 37
Original Shlokaअश्वैरश्वान् गजैर्नागान् योधैर्योधान् रथैरथान्।।5.46.37।। स कपिर्नाशयामास सहस्राक्ष इवासुरान्।
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सः कपिः that vanara,सहस्राक्षः thousandeyed Indra, असुरानिव as he did (destroyed) demons, अश्वैः with horses, अश्वान् horses, गजैः with elephants, नागान् elephants, योधैः with warriors, योधान् warriors, रथैः with chariots, रथान् chariots, नाशयामास destroyed.
The vanara pitted horses against horses, elephants against elephants, warriors against warriors and chariots against chariots as Indra destroyed demons.