Mid-East Allied Forces

The Chūtō Rengō (中東連合) is a nation consisting of a coalition of various territories. They are enemies of Marley who were at war with their nation for four years after the warriors' failure to capture the Founding Titan, though the Allies eventually lost the war and presumably lost autonomy of their nation.

Geography
While little can be said of the climate or exact location of the Mid-East Allied Forces, it is said that the nation was located on a peninsula.

Military
The Mid-East Allied Forces was Marley's major adversary in the four-years long Marley Mid-East War. It was a technologically advance world power, a result of being compelled to focus on military development due to the threats posed by Marley's Titans. The Allies' armament had some weaponry that was of more-or-less similar sophistication to their enemy nation of Marley, but was superior in many other areas.

Army
Like Marley, the Allies had in service modern small-arms such as bolt-action rifles and water-cooled machine guns, but the similarity ended there. Perhaps the best example that illustrates the Allies' vigilance of Titans was the anti-Titan artillery. Designed with fighting Titans in mind, it can fire 100mm armor-piercing shells which are capable of destroying even the Nine Titans, but can also fire fragmentation shells for regular bombardment mission. The gun was ubiquitously mounted on a field gun carriage, but was also fitted on the turrets of armored trains. In the battle of Fort Slava, the fort was rung by a large number of anti-Titan field guns, suggesting that the Allies had mass-produced the weapon to the point that it became its standard artillery piece.

Being the defender in Fort Slava, the Allies built extensive fortifications in and around the fort to fend off the Marleyan assaults. Its troops were well dug-in in an all-round defense line formed by a single ring of trench, which was augmented by numerous concrete machine gun pillboxes, and overwatched by AT artillery pieces installed on the ancient forts. For some reasons (likely due to limited depression angle), the guns on the fort were able to engage Titans inside but not outside the fort, reducing their role in the latter fighting to bombardment by indirect fire. For example, when Pieck and Porco attacked the outer defense, the guns merely responded by firing ineffective fragmentation shells. To compensate for that weakness, there was a network of rails between the fort and the trenches. An armored train patrolled the three-rings network and provided moving anti-Titan firepower to the outer layer of defense.

While initially successful against Marleyan human wave assaults, the Allies defense plan proved vulnerable to an attack from the air. Its outer defense also overly relied on the armor train for anti-Titan fire support, as when Gabi put the train out of action, it was easily picked apart by her two Titan comrades.

The Allies both feared and resented Eldians to a morally questionable degree, reflecting the world's attitudes toward the Eldians. For example, Allied soldiers were willing to fire on a seemingly unarmed and surrendering Gabi, simply because they suspected that she was an Eldian and might turn into a Titan in any moment. In another instance, when Falco tried to save the life of an wounded Allies' soldier, the captive vehemently refused it because he did not want to be "corrupted" by the Eldian "devils".

Navy
The Allies' navy was the primary combatant in the four years war, which until its very end was fought on the sea. It was armed with state-of-the-art warships which outmatched any Marleyan vessels, giving it significant advantage in the sea battles against Marley.

The Allies' steam-powered battleships were armed with a main barrage of two large caliber dual-gun turrets and a number of smaller guns on either boards. While heavily armored, they were not above withstanding a mass barrage of 100mm armor-piercing shells hauled by Zeke and were all sunk. It was unclear whether its main guns were of similar design as the anti-Titan artillery pieces used on land. Although the blast of its shell was powerful enough to stun and maul the Armored Titan, it did not penetrate, unlike the anti-Titan artillery, which may suggest that it was the sheer mass of the naval shells rather than dedicated anti-Titan design that did the deed.

With its considerable technology gap over its Marleyan counterpart, the Allies' navy inflicted horrid damage to the latter over the course of the naval engagement period of the war. Udo mentioned that it took four years for the Marleyan navy to control the sea with almost half of its own fleet lost, while Magath noted that Marley won only by numerical superiority. Even though it was no longer in command of the sea, an Allies fleet included eight capital ships still remained in Fort Slava's naval station, and its importance was such that its destruction could influence the outcome of the war. Eventually, the fleet was destroyed by Zeke, sealing the end of the war once and for all.

Marley arc
After Marley lost the Colossus Titan and the Female Titan during the Paradis Island Operation, the Mid-East Allied Forces took advantage of their enemy's weakened military capabilities and declared war on Marley. Over the course of four years, the Mid-East Allied Forces gradually lost their advantage against the enemy, losing control of the seas by the time of the battle of Fort Slava. The Allies' navy, however, dealt significant damage to the Marley navy in their naval battles.

At some point before or during the war, the Allies develop the anti-Titan artillery, a heavy cannon designed to kill any Titan in a single shot, even one of the Nine Titans.

After four years, the Allies make a final stand at Fort Slava, a fortress equipped with heavy machine gun defenses and anti-Titan artillery overlooking their last naval station. Commander Magath of the Marley military leads a siege against the fort alongside an 800-man unit of warrior cadets, with their warriors kept on standby, as Magath is unable to use them due to the anti-Titan defenses implemented by the Allies. However, when cadet Gabi destroys the armored train carrying artillery around the fort, the Allied soldiers are attacked by the Jaw Titan and Cart Titan, the Titans of Porco Galliard and Pieck. Soon afterwards, once the outer defenses of the fort are destroyed, a zeppelin overhead carrying Zeke Yeager and Reiner Braun releases dozens of parachuting Eldians above the fort which Zeke turns into Titans using his Titan powers, raining devastation down upon the Allies. When all the Titans are killed, Reiner's Armored Titan and Zeke's Beast Titan finish off the remaining artillery guns, and Zeke tosses spare rounds at the fleet in the nearby bay, destroying the last of the Allies' fleet and ensuring victory for Marley.

A peace treaty is signed after the Allies' defeat at Fort Slava, and the Mid-East Allied Forces presumably lose their autonomy following the war. However, other nations opposed to Marley praise the Allied Forces for their success with the anti-Titan artillery, signalling the coming of the age when mankind has overcome the power of the Titans. Survivors of the battle of Fort Slava are later sent home traumatized to serve as a reminder of the Eldians' demonic nature.

Trivia

 * Given the fact that the Mid-East Allied Forces are said to be located on a peninsula that lost its political autonomy, it is possible that the nation is located either on the peninsula resembling a mirrored or the peninsula resembling a mirrored  in the southeastern region of Marley as displayed on the map in Chapter 93.
 * Their army uniforms resemble that of Ottoman Empire during World War I. Its service rifle seems to model after the Russian Mosin-Nagant M91 rifle but its machine gun seems to be the German MG-08.
 * The Allies' trench was built in a clean straight line, allowing a whole line of defenders to be wiped out by the flanking Cart and Jaw Titans in one fell swoop. In real life, WW1-era trenches were always dug in zigzag lines to prevent exactly that kind of damage from happening.
 * The battleships were obviously inspired by the dreadnought, a dominant type of battleship in the early 20th century in the real life.

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