This episode is part of the Avatar Book One - Water
Avatar The Last Airbender Episode Guide ~ via Wiki
After being chased out of a Fire Nation festival, Aang, Sokka, and Katara encounter a group of Fire Nation deserters, led by Firebending master and ex-general Jeong Jeong. After realizing that this could be his only chance to learn Firebending, Aang- with the help of Avatar Roku’s spirit- convinces Jeong Jeong to teach him Firebending. Meanwhile, Admiral Zhao continues his chase for the Avatar.