Valmiki Ramayana Yuddha Kanda Sarga 67 Shloka 25

महाबलाः Vanaras of exceptional strength, शैलैः rock, वृक्षैः trees, तलैः palms, पादैः feet, मुष्टिभिः च and fist also, महाकायम् of huge body, कुम्बकर्णम् Kumbhakarna, सर्वतः all over, अभिप्रदुद्रुवुः attacked severely.

Those Vanaras of exceptional strength attacked gigantic Kumbhakarna on all sides by rocks, trees and by their fists, hands and feet also.