Valmiki Ramayana Yuddha Kanda Sarga 70 Shloka 24

तदा then, मारुतात्मजः son of wind god, हनुमान् Hanuman, उत्पत्य got up, आपतन्तम् , तम् , वज्रकल्पेन which was like a thunderbolt, मुष्टिना with fist, मूर्ध्नि forehead, आजघान hit.

Then the son of wind god, Hanuman observing Devanthaka coming towards him, got up and hit him on the forehead with his thunderbolt like fist.