Valmiki Ramayana Yuddha Kanda Sarga 42 Shloka 2
Original Shlokaरुद्धांतुनगरींश्रुत्वाजातक्रोधोनिशाचरः । विधानंद्विगुणंश्रुत्वाप्रासादंसोऽध्यरोहत ।।6.42.2।।
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रुद्धां occupied, तु also, नगरीं city, श्रुत्वा hearing, जातक्रोधो very furious, निशाचरः night ranger, विधानं knowing, द्विगुणं twice, श्रुत्वा hearing, प्रासादं top of the mansion, अध्यरोहत planning for the protection of Lanka.
On knowing that Lanka is occupied, the night ranger Ravana, became very furious and doubled the forces of Lanka for the protection and went to the top of Lanka palace.