Valmiki Ramayana Yuddha Kanda Sarga 67 Shloka 61

तदा then, तस्य his, विशाले broad, भुजान्तरे between shoulders, तत् that, शैलशृङ्गम् mountain peak, सहसा forcefully, विभिन्नम् broke into pieces, ततः thereafter, प्लवङ्गाः monkey, सहसा forcibly, विषण्णाः desperate, रक्षोगणाश्चापि the troops of Rakshasas, मुदा joy, विनेदुः roared.

Then the mountain peak dropped on the chest broke into pieces. Thereafter the monkeys were despaired, and Rakshasas roared in joy.