Srimad Bhagavatam Canto 09, Chapter 10, Text 09

SB 9.10.9

raksah-svasur vyakrta rupam asuddha-buddhes
 tasyah khara-trisira-dusana-mukhya-bandhun
jaghne caturdasa-sahasram aparaniya-
 kodanda-panir atamana uvasa krcchram
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
While wandering in the forest, where He accepted a life of hardship, carrying His invincible bow and arrows in His hand, Lord Ramacandra deformed Ravana’s sister, who was polluted with lusty desires, by cutting off her nose and ears. He also killed her fourteen thousand Raksasa friends, headed by Khara, Trisira and Dusana.
Srimad Bhagavatam Canto 09, Chapter 10, Text 08
Srimad Bhagavatam Canto 09, Chapter 10, Text 10