Valmiki Ramayana Yuddha Kanda Sarga 69 Shloka 48
Original Shlokaतेपादपशिलाश्शैलैश्चक्रुर्वृष्टिमनूपमाम् । बाणौघैर्वार्यमाणाश्चहरयोभीमविक्रमाः ।।6.69.48।।
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बाणौघैः arrows, वार्यमाणाः heroic, भीमविक्रमाः of dreadful valour, ते those, हरयः monkeys, पादपशिलाश्शैलैः trees, rocks and mountains, अनूपमाम् unparalleled, वृष्टिम् rain, चक्रुः showered.
The Vanaras of dreadful valour and unparalleled might waged with trees, rock and mountain when obstructed by the Rakshasas।।