Author's Note:

This is the First time that i'll submit my Fanfiction story into my Wattpad account that hasn't been touched by so many years since 2016, Anyways i'm going to write this down from my DeviantArt into Wattpad in order to make my clear writings for my Fanfiction story.

For those who don't know, this is the First time that i'll write my first GATE fanfiction story crossed-over with Call of Duty and Avatar the Last Airbender, that's right! AVATAR: The Last Airbender in GATE series fanfiction, I was inspired by xjames2001, So why not 'll do the similar thing but with some twist, which is i'm doing it now.

Anyways without further A-DO, let's get into it!

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https://youtu.be/d1EnW4kn1kg

Katara's Narration/POV

" Water....

Earth....

Fire....

Air....

Long ago, the four nations used to lived together in Peace and Harmony. Then, everything changed when the Fire Nation attacked. Only the Avatar, master of all four elements, could stop them, but when the world needed him most, he vanished. A hundred years passed and my brother and I discovered the new Avatar, an airbender named Aang. And although his Airbending skills are great, he has a lot to learn before he's ready to save anyone. But I believe Aang can save the world...... Not until one day, when we are close to our victory in the Invasion of Fire Nation's capital on the day of Black Sun, Something went wrong, It was Azula managed to sabotage our Invasion trapping our allies, leaving Me, Aang and our remaining allies to be demoralized after our defeat. How could the Fire Nation knew this and how did they managed to trapped us? How did they invented a new weapon that can kill a bender within matter of weeks before our invasion and how they even managed to capture Half of the World?

Even though, we have a new ally and that is Prince Zuko of the Fire Nation, he wanted to convince us that he is not our enemy but rather a friend, I was still not convinced because i still remember all of the bad memories of him in the past months, then I later heared the news about the Fire Nation leading an expedition to the holy Wu-Yang Hill, this believes that Aang in his visions as told by Roku himself that was the World where the so-called Men-in-Green will assist Aang to end the war once and for all to restore Peace and Order in this World, Which i really hoped for. "

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Chapter 0: Prologue

In the darkness falls, Armored clad soldiers ready to assault their position some of them riding on a Ostritch-like horses and Rhino-lizards while other cavalries ready to charge with their Tank-like vehicle facing to their enemies unknown to them are the soldiers wearing in Green uniform armed their guns aiming their sights on them along with Tanks and Armored Vehicles serves as their Fire-support .

If you're asking why are those Asiatic-looking soldiers are going to fight against the Japanese and allied soldiers, then here's why.

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 It's been Three days since the Day of the Black sun has ended and the Fire Nation secured their victory by changing the Tides of the War thanks to Princess Azula's knowledge about the upcoming Eclipse after she mortally wounded Avatar who tought to be dead, As well as the potential invasion of Earth Kingdom alongside with the Avatar and later their new invention that could lead to their victory.... The Airships and War baloons, despite of their loses from the Avatar and his allied resistance, the Fire Nation however still managed to defeat him and capturing his comrades which they taken them to an unknown Prison camp. Afterwards the The Fire Nation still continue to expand it's territories from North to South parts of Earth Kingdom and former Air Nomad territories which gained them more resources to win the War and defeat the Avatar and his friends for good. Afterwards they managed to secure their second capture of Omashu from the remnants of Southern Earth Kingdom's resistance forces defeating them with their new weapon and that is the Musket, for those who don't know the Fire Nation decides to invent their own weapon that could take advantage aginst both Benders and non-Benders which can ultimately kill them even they wore a heavy armor, Especially if they dare to resist the Fire Nation in fact they killed every single Earth Kingdom citizens including those who accused as a spy for the Rebels especially from White Lotus without any evidence and mercy as an example. Even worse that the Fire Nation is keep making an Imperial propaganda that the Avatar is still dead and the failed invasion of Fire Nation capital is a False flag attack made by the Earth Kingdom rebels to make people losing their hope and free themselves from the hands of Fire Nation as they feared that the Fire Nation will become a dominant Empire in this World. Until one day a Discovery will change the History of the Earthrealm forever.......

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Outskirts of Omashu, Five Days after the Avatar and his allies failed invasion.

A scouting team consisting of A War balloon operator and Two firebending soldiers of the Fire Nation Army are doing some reconnaisance after their successful invasion of Villages and recapture of Omashu when suddenly they discovered something on Wu-Yang Hill.

War Balloon operator: " My goodness what is that?! " said by the Balloo operator as he saw something.

The War balloon operator pointing his finger to a mysterious Gate-like structure in the Wu-Yang hill, one of the Holiest sites in Earth Realm where claimed that the Humans in their world originated and evolved.

Fire Nation soldier #1: " What is it Pilot, you're pointing at? is it the Avatar and his allies? " Said by the Soldier.

War Balloon operator: " NO! there was something down there, i am not sure what it is but it seems that the Gateway is seemed opening! " the Balloon operator replied.

Fire Nation soldier #2: " Gateway? that's impossible i know that story was from some sort-of fairy-tale legends from children's book or something, there's no way that you can find that such kind of Gateway in the middle of nowhere! " Said by the Fire Nation soldier.

War Balloon operator: " No i am not lying look down there! " He said as he wasn't lying at all.

As the War Balloon operator pointing his finger to the hill, he was not lying and everyone is shocked that the Gateway to another world is indeed real and seemingly structure is completing it's final stage to materialize.

Fire Nation soldier #1: " Quick! We must tell this to our superiors and to the Fire Lord, they will be shocked on what we saw at the Hill! " the Soldier said as he orders everyone to return to their Camp.

Everyone nodded and agreed that they need to return to their base as they must report on what they discovered. Afterwards after they reported this event to their superiors some of them didn't believe at first but then later the scouts proved them wrong by sending a small regiment of Soldiers, they were shocked and amazed that the Gateway is materializing and finally appearing to their world.

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Fire Nation Imperial Palace

Afterwards the Fire Nation officials reported this event to the other Military officials and to the Fire Lord himself where everyone is surprised to their shocking discovery including the Fire Lord and his daughter Princess Azula on his side.

Among those Officers were present in the meeting was General Bujing, General Shinu, Lt. General Yamanada, Admiral Chan, Admiral Liang and War Minister Qin.

War Minister Qin: " According to the reports from our soldiers in the Battlefield, they spotted Gateway Pagoda in Wu Yang Hill, similar to the Children's books from the legends. " the War minister said.

Ozai: " Well what do you know, it seems that the Legends are true, A gateway appeared on the Holiest sites of the occupied Earth Kingdom has appeared how luckily we are, It seems that the Spirits are blessed us with this such way, I always wonder what was looked like on the other side of the Gate? " said by Firelord Ozai to his Generals.

The Generals and Naval Admirals are making a doubt about the appearance of the Gate especially when the War will come into close within 4 Months, one of them said.

Fire Nation General #1: " My Lord i have a doubt on this situation, what if the world on the other side of the Gateway was a trap? We still don't know what was behind of that thing! " Said by the General named Shinu a former Colonel.

Fire Nation General #2: " I don't think that World behind of the Gateway might be a trap, I believe it could be a treasure trove imagine if we manage to conquer the other side of the World and enslave their populace whether or not they Bend elements or not, we have developed new Weapons and Highly trained men who also Firebend to eliminate them so why bother? " said by the General named Bujing a ruthless Field commander of the Army and a Grand General.

Fire Nation General #3: I have to agree with General Shinu Zin-Yang, General Bujing Xin you have no idea what is behind on that Gateway there's a possibility of that thing was a Death trap for our troops! " Said by the another General.

Fire Nation Admiral: " Disagree i think we can outnumber them, We have 2 Million strong Armies and fleet of Warships so why should we worry about it? Besides we need more resources in order to Win in this War no matter what, if that isn't enough we can recruit more Soldiers from Mainland and the colonies, as well as the defectors from Earth Kingdom, I am sure we are confident to win in this War before the Sozin's comet arrives. " the Admiral whose name is Chan interjects

As the Military officials are continuing their debate whether or not they should go to Gate, they Fire Lord has spoken again. This time with more ambitious tone.

Ozai: " Enough With this senseless debates! As your Fire Lord i hereby orders you all to send a Hundred Fifty thousand strong troops to the Hill and secure the Gate before it materializes, we must send our troops to the other side of the Gate and establish an expeditionary force to discover what valuable resources we could find there! "

Fire Nation General #1: " Yes my lord it will be done, Our troops stationed in the occupied Gaipan, Mining village and Senlin has already send their troops to secure the Gate, while our main forces are on it's way. " Said by the General.

Ozai: " Good General, soon this World once that our Empire won this War no one can stop us now! Not even the Avatar himself even if he find some new Allies. Azula you lead your on Task Force on this expedition do not Fail me! " The Fire Lord orders.

Azula: " Yes Father, your majesty! " She replied.

Azula leaves the War Room along with her personal Dai Li agents who serve as her bodyguards.

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Two Days later.....

Insert theme: 

https://youtu.be/L-9zf5K44wE

Avatar The Last Airbender - The Phoenix King

It's been days since the Gateway has appeared and it is completing it's materialization, the once undisturbed Holy site has been disturbed by thousands of Soldiers of the Fire Nation, even the people of Southern Earth Kingdom heared the news about the Gateway appearing in the hill was true, they believe it was summoned by the Spirits or by the past Avatars who wanted end the war by sending the Fire Nation to other world, others don't believe it but some are do. However some of them are already lost their hope that the Avatar will never save them only time will tell as they cower in fear.

Since Azula was part of the Expeditionary force, she was also part of the Joint command leading her troops to the unknown as Tanks rumbling on the ground, Wheeled trebuchet are rolling, while Foot soldiers both Firebenders and Non-Firebending musket soldiers are ready their rifles fully loaded attached with bayonets to make sure that their enemies are dead, War baloons are now loaded with bombs ready to strike.

The Troop commander is making his speech to his troops as he said;

Fire Nation Lieutenant General/Troop commander: " Today is the day that we will make History! It has been honored to be accompanied with Princess Azula herself as our main commander of this expedition to lead our forces to the other world to seek resources and to deal with those who oppose us! We have a strong Armies, Tanks and fleet of Airships that no one has ever seen it! Not even the Avatar and his allies dare to stopped us! TODAY WE WILL CROSS THE GATE INTO THE UNKNOWN WORLD, ALONG WITH OUR ARMIES AND IF THOSE PEOPLE WILL DARE US, WE WILL KILL THEM AND FORCE THEM TO INTO SUBMISSION! " Said by the General to his troops.

Then followed by Princess Azula with her speech;

Azula: " It is an Honor to be part of this Expeditionary forces as my Father requested it, i coudn't believe that the Legends were become a reality When this so-called gateway materializes, I believe that this portal to another world is a gift by the Spirts as they learned that they should never ever dare to face the glorious Fire Nation, now we will show those people on the other side of the Gate who are they challenging, and we will show them who is the true master of two Universes as we Fire Nation will never defeated! " said by the Princess herself as she gives an Honorable speech to the Fire Nation forces.

Then it followed by the loud cheering and yelling from the Fire Nation forces troops by troops as the Gateway has finally been materialized then the troop commander finally said;

FN Lt. General/troop commander: " TO THE GATE!!!!!!!!!! " said by the General to his troops.

As the 150,000 strong Fire Nation soldiers and armored cavalry has finally enters the gate proudly, Where they stepped into the unknown world or does it?

PS: Let's pretend that those tanks were behind of the Infantry.

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Epilogue.

Western Air Temple.

It's been A week since Zuko is become part of Aang's Team Avatar as he finally teaches him how to Firebend, although not everyone of team Avatar especially Katara trusted him atleast for now, speaking of which Haru, Duke and Theo are still finding some valuable information about the recent activities of the Fire Nation and it seems that the Fire Nation's military activity as limited to patrols when they found something gold.

Katara: " Haru! Thank goodness you're alright! " Katara said to Haru.

Haru: " Thanks Katara, but you don't have to worry about us, we're doing this for Aang by the way. " He replies.

Duke: " Hey GUYS! Haru and I would like to say something we discover! " said by DUke to everyone about their discovery.

Haru: " It seems that the Fire Nation is decreasing their Military presence since our last invasion against them, in fact we heared that they were heading to Wu-Yang hill that hill was almost miles away from my village they captured. " said by Haru to everyone.

Sokka: " Why would the Fire Nation heads to the holiest sites in that region, there's nothing special about it? " said by the young warrior named Sokka.

Theo: " Yes indeed! In fact they said they were heading to some sort of Gateway or something, i don't know that's what we heared from the soldiers. " stated by Theo

Then Zuko realizes something important and explained.

Zuko: " Maybe there was a Gateway was their objective, I don't know but according to the lost history of our time that we Humans came from other world before we live on the Giant Lion Turtles and later resided here, but it's just some old fairy tale on both two Nations by the way. " said by ZUko as Sokka replied to him.

Sokka: " Oh do you believe on that such kind of Children's book? Oh please there is no such thing " Other world " you speak of, I mean if that Gateway exist, then it should appear it right before the War ends! " Sokka said as he shrugged off.

Katara: " I agree with Sokka, There is no way that the Gateway mysteriously appeared on the middle of nowhere, right Aang? " said by Katara as she agrees with her brother.

However Aang immediately interjects after hearing the news.

Aang: " Actually i disagree, Remember the time when i talked to Rokku? when the time has come, a group of Men in Green will Help me to fight against the Fire Nation as they will assist us to restore the Peace and Order in this world, but he also tells me that the Nation of the Men in Green has a dark past that i need to correct them before they fall into corruption, but i still believe that they were good people and he maybe right. "

Zuko: " Did my maternal Great-Grandfather said that to you? " said by ZUko asking Aang.

Aang: " Yes he did. " the young AVatar answered.

Zuko: " Hope you are right Aang, hope you are right..... " the Prince replied.

As everyone went silent and take some rest hoping that they will end the war in a right time.......

TO BE CONTINUED.

Insert theme: Peace - ATLA Theme. 

https://youtu.be/2ftScS4fLbQ