LESS THAN 24 HOURS LEFT UNTIL SECRET OF THE FIRE NATION! I AM SO EXCITED IT ISN'T EVEN FUNNY!
Disclaimer- I do not own Avatar: The last Airbender
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Aang walked down the chamber, misery flooding his body. He knew that Katara didn't like it, but it had to be done. Suddenly, the leaders ran down the isle, motioning Aang to come. "The fire nation is at the outer wall! We need to go, Aang!" Aang was surprised, he had not expected the fire nation to come during the night, as their powers are weakened. There had to be a catch. But as he ran with the leaders, Sokka included, he stopped. He stood there, and hesitated.
Finally, he made up his mind. He couldn't just leave her there. He had to make it up to Katara, somehow, after the battle. He turned back and quickly headed for Katara's room once again.
As he entered, he noticed that Katara was sleeping. The sheets were damp, and Aang felt ever so guilty. He hated to see Katara like this. He bent down, and kissed Katara softly on the cheek. He rose and left the room, quietly whispering as he closed the door.
"I'm so sorry, Katara. Please forgive me."
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Aang stood on the outer wall of the great city, and was shocked. Even at night, when it was hard to see, he could still make out hundreds of thousands of fire nation troops, hundreds of Fire Nation Trebuchets, and the whole sky was swarming with war balloons. Even with all the waterbenders and earthbenders combined, there was no way they could win. Ba Sing Se was going to fall.
Unacceptable. He needed to change the odds. But how? Even in his Avatar State, he couldn't repel them all. The trebuchets had long range attack, and it could strike Aang even in his Avatar state. If he died while in the state, then the world would fall. The only advantage they had was the waterbenders. However, there wasn't a whole city made out of water, like the North Pole. Earth Kingdom soldiers had dug pits around the wall, and filled it with water for the waterbenders' use. However, it won't be enough. The trebuchets could kill them all.
Basically, the fire nation was going to snipe Ba Sing Se, and there was nothing they could do about it. There was only one option left. Fight them head on and hope for the best.
The Gate of Ba Sing Se opened, and out marched hundreds of thousands of troops. At night, the earthbenders couldn't see a thing. The fire nation, however, didn't need to worry. They would just shoot at the direction of Ba Sing Se. Another snag.
Aang heard hundreds of snaps and swooshes, as the flaming fire balls flew towards them. At the top of the wall, Aang could see, but the soldiers down at the ground couldn't. He roared with all his power, "Earthbenders! Bend earth around the outer wall! Right… NOW!" The earthbenders moved their body in unison, their hands making an upward motion, and the land erupted from the ground. Hundreds of the fireballs hit the wall, obliterating it into a million fragments. However, around a hundred flaming balls from hell were still in the air, heading toward the wall. One by one, they hit Ba Sing Se's outer wall, slowly making earth crumble. Fortunately, the wall was still standing, and around a hundred thousand feet of solid rock still remained. If they continued like this, however, Ba Sing Se would fall by sunrise. This is bad. Real bad.
Bombs came out of nowhere, exploding on top of the earthbenders and waterbenders. Slowly, group by group, they fell. Sokka roared to Aang, "The war balloons! See if you can take them out with your airbending!" Aang nodded, and jumped down onto the ground, landing with a dramatic finish with his staff, with sent a huge gust of wind towards the sky. Two balloons fell, and groups of fire nation soldiers were crushed on impact.
"There's too many!" Pakku shouted to Aang, while he and his team used the water to quench the flaming rocks, therefore it soften on impact. However, the wall was slowly, but steadily falling. Aang shouted back to the leaders,
"Keep on making earth walls! Stall the outer wall from falling! I'll try to take down as much of the war balloons as possible!" He then addressed to the group of highly trained stealth earthbenders, who had nothing to do at the moment.
"I'll make a tornado, and you guys bend rocks in it! I'll shoot them down!" The soldiers did as they were told, and the sound of swishing was heard again as rocks flew through the sky, poking through the balloons, therefore rendering them useless.
Just when the plan had started to work, Aang was shot hit on the back of his head with a boulder. He flew ten feet away, hitting the wall. Blinking, he saw the image of an earthbender being attack from all sides, guilty for his treachery. But he had done his job, and they all knew that. He had shut down the Avatar, and the fire nation was advancing. Without him, Ba Sing Se would crumble. Aang, desperately trying to stay awake, failed. He went unconscious as blood began to leek through the back of his neck. He had no idea what happened anymore.
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Katara suddenly woke up to the sound of distant shouts and yells. She hurriedly headed out the door to find out what was going on, only to be stopped by two guards.
"Ma'am, you are not to leave this room until further notice, as requested by the Avatar." Katara maddened.
"Well, did he tell you that I choose what I want to do, not him?" And with that, she water-whipped them both, and they fell to the ground. She ran past the bodies, hoping that there was still time.
But she was wrong. Time had already run out.