Valmiki Ramayana Yuddha Kanda Sarga 97 Shloka 25

सः he, तदा then, महाहवे great war, सहसा at once, उत्पत्य getting up, मुष्टिम् with fist, सन्वर्त्य whirling, वेगेन violently, राक्षसस्य Rakshasa's, वक्षसि on the chest, पातमायास hit

Then in that great war, Sugriva getting up at once whirling his fist, hit (Virupaksha) him on the chest.