Valmiki Ramayana Sundara Kanda Sarga 1 Shloka 125

ततः then, शतक्रतुः one who has performed a hundred yajnas, सहस्राक्षः Indra, क्रुद्धः in anger, तत्र तत्र here and there, सहस्रशः in thousand, पर्वतानाम् of the mountains, पक्षान् wings, वज्रेण with the thunderbolt, चिच्छेद cut into pieces.

"Provoked at this, the thousandeyed Indra who had performed a hundred sacrifices cut off the wings of mountains into a thousands pieces with his thunderbolt.