While Katara herself becomes a great waterbending master, Commander Zhao plans a siege on the Northern Water Tribe. Meanwhile, Sokka's on a mission to stop this siege while Aang tries to buy them some time.
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It's almost twilight, Admiral. As your military consultant I must advise you to halt your attack. The waterbenders draw their power from the moon and it is nearly full tonight. You should wait and resume the attack at daybreak.
Oh, I'm well aware of the moon problem and I am working on a solution. But for now, daybreak it is.