Watch anime online, stream anime episodes online for free.Watch Avatar the last airbender Book 1 Water Episode 19 English version online and free episodes. Anime Episode guide, Chapter Avatar the last airbender Book 1 Water Episode 19 The Siege of the North, Part 1 As the Fire Nation’s forces close in on the Northern Water Tribe, the leaders and citizens scramble to find a way to defend against the armada. As night begins to fall, Admiral Zhao decides to heed Iroh’s advice and halt the attack since waterbenders are stronger under the moonlight. Zuko leaves Zhao’s ship and infiltrates the tribe on his own, seeking to capture Aang. Aang believes going into the spirit world and speaking to the moon and ocean spirits could give him the wisdom to defeat the Fire Nation.