Valmiki Ramayana Yuddha Kanda Sarga 11 Shloka 21

ते: of these, एके: some, रुचिरान् on exquisite, रथान् chariots, एके: some, दृप्तान् proud, दृढान् sturdy, हयान् on horses, एके: some, नागान् elephants, अधिरुरुहुः ascended, एके: some, पदातयः on foot.

Of those (Rakshasas) some went on exquisite chariots, some on proud sturdy horses some ascended elephants and some by foot.