Valmiki Ramayana 5.2.46

तदहं स्वेन रूपेण रजन्यां ह्रस्वतां गतः ।लङ्कामभिपतिष्यामि राघवस्यार्थसिद्धये॥

tadahaṃ svena rūpeṇa rajanyāṃ hrasvatāṃ gataḥ |laṅkāmabhipatiṣyāmi rāghavasyārthasiddhaye ||

Our plain-language meaning of this verse is waiting for scholar review.