Valmiki Ramayana Yuddha Kanda Sarga 59 Shloka 29
Original Shlokaसर्वेपर्वतसङ्काशास्सर्वेपर्वतयोधिनः । सर्वेदीप्तायुधधरायोधाश्चास्यमहोजस:।। 6.59.29।।
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महोजस: great warriors, अस्य of him, योधाः in war, सर्वे all, पर्वतसङ्काशाः like mountain, सर्वे all, पर्वतयोधिनः fight with mountains, सर्वे all, दीप्तायुधधराः glowing weapons.
"The great warriors of Ravana fighting in war are like mountains and all fought with mountains and glowing weapons."