Valmiki Ramayana Yuddha Kanda Sarga 70 Shloka 25

तदा then, वीरः heroic, बली strong, वायुसुतः son of wind god, शिरसि on head, प्रहरत् blow, सः he, महाकपिः great monkey, नादेन sound, राक्षसान् Rakshasas, अकम्पयच्चैव trembled.

When the heroic and strong son of the wind god hit on the head of Devanthaka, the Rakshasas trembled by the sound of the great monkey 's blow.