S2E13 · Book Two: Earth - Chapter Thirteen: The Drill

Having made it to the outer wall of Ba Sing Se, the kids confront a Fire Nation army that is driving a massive Fire Nation drill, which poses an imminent threat to the last Earth Kingdom stronghold. Meanwhile Zuko and Iroh make crucial mistakes which begin to attract Jet's suspicions. Can Zuko and Iroh keep their cover? Will Aang manage to save Ba Sing Se from the Fire Nation?