Valmiki Ramayana Yuddha Kanda Sarga 3 Shloka 19

राम: O Rama, स्वयम्: Ravana himself , युयुत्सुः one with hostile intention, प्रकृतिम्: assuming natural tendency, आपन्नः one who has adopted, रावणः Ravana, उत्थितश्च: eager to combat, बलानाम्: army, अनुदर्शने: looks after, अप्रमत्तश्च: ever very alert

"O Rama Ravana, who is hostile in his intentions, assuming his natural tendency which is eagerness to combat, is always very alert and looks after the army."