Marley

In Chapter 106, Yelena describes the unit's organizational structure as consisting of fifty divisions, each with 20,000 soldiers, totaling one million. The majority of members are Eldians and Marleyans. The navy comprises three fleets, each with 21 warships. Currently, they are actively developing their air force. Initially Marley only recruited pure-blooded Marleyans, but due to the unit's frequent involvement in the "cleanup" of failed Titan science bio-weapon experiments and rescue missions involving out-of-control Titans, the mortality rate was extremely high. Many members even experienced mental breakdowns after witnessing the horrific sight of Titans tearing apart their comrades. Therefore, Marley had to adopt a conscription system to recruit Eldians, mercenaries, and criminals with extreme violent tendencies to build this first line of defense for the nation. Their primary responsibility is to rescue survivors and eliminate Titans in the event of bio-weapon leaks.

Marley's large-scale expansion led to hostility from other nations. Over-reliance on the power of the Titans caused its military technology to lag behind. In the war against the Mid-East Allied Forces, the main battlefields were at sea, where the Titans could not be used. The Marley navy, relying on outdated ships, suffered heavy losses, and the army, aided by Eldian Warrior unit, only achieved a pyrrhic victory. After this war, the Marleyan Imperial Military decided to abandon its reliance on the Titans and focus on developing its military technology.

Following the Survey Corps' attack on the internment camp in 854, the Marley army was quickly deployed to the city to assist the Marley Public Security in maintaining order and evacuating survivors. However, due to the disparity in numbers and the power of the Titans, they ultimately suffered a devastating defeat. The Survey Corps also used these unfortunate soldiers as cannon fodder to test the combat capabilities of various weapons, including the new Thunder Spear and explosive charges. Apart from a few members, including Magath and Koslow, almost all the members of the command who were deployed to the rescue mission were wiped out.

After suffering a crushing defeat at the hands of the Survey Corps in the Battle of Liberio Internment Zone, with the entire high command of the army wiped out, Magath took control of the military and began reforming the increasingly corrupt Marleyan Imperial Military. After the war, he called on countries around the world to form World Allied Forces, preparing to launch Scorched-Earth Operation against Paradis Island.

At Reiner's suggestion, they launched an attack on Paradis Island without waiting for the World Allied Forces to complete its assembly, intending to stop the Rumbling. However, Eren activated the Rumbling at the last moment before his death, and most of the Marley soldiers were killed by the Pure Titans controlled by Zeke. The remaining Marley army escaped back to Marley in airships, while the Marley warriors and Magath remained on Paradis Island, allying with the Survey Corps to stop the Rumbling.

In chapter 130, the Marley Navy and the World Allied Fleet lined up in the waters near the mainland and opened fire on the Colossal Titan swimming across the sea in an attempt to prevent it from landing. They were ultimately annihilated by the Colossal Titan.

The Marley army failed to prevent the Colossal Titan from landing on the North Blue of Marley military and civilians began to flee. The Marley Continent had already been largely destroyed by the Colossal Titan.

In chapter 133, the Marley Continent has been destroyed. The remaining Marley air force uses all of its Hindenburg airship to bombard the Founding Titan.

The Marley army primarily used weapons and equipment from World War I. Eldian soldiers wore black combat boots, light brown combat uniforms, and each carried a bullet belt. All squads and commanders wore Brodie helmet, and their combat uniforms featured unit patches. Unit insignia were printed on the side of the helmets. During biological and chemical warfare, all units were equipped with box-type gas masks (self-priming long-tube respirators, also known as gas-filled long-tube respirators). The commander-in-chief and adjutant carried MK II telescope (Nottingham Instruments Ltd. Bino. Prism No. 5 7x50). Herein lies a contradiction: these binoculars were provided to the British Coast Guard during Second Shinobi World War, while the historical context is World War I.

In addition, the Marley Public Security frequently faces high-threat combat missions, and they are equipped with military-grade gear. Members wear black combat boots, white military trousers, white British Army overcoats, white military caps, black ties, and belts.

In the animation, he is depicted as wearing a pure blue combat uniform, a dark blue top and overcoat, a blue peaked cap, black military boots, a combat vest with a belt, and ammunition box straps.

The pure-blooded Marleyans in the Marley army wore German-style steel helmets. The navy wore M1 helmet.

During the war against the Mid-East Allied Forces, Marley's Eldian troops used standard German-made Gew.88 rifles and American-made M1903 Springfield rifle as their standard weapons. Some members also carried M24 stick grenade and Maxim machine gun as support firepower. Furthermore, on the destroyed Middle Eastern Allied Forces train, Marley confirmed a new type of heavy weapon developed by the Mid-East Allied Forces —the American M2/101 howitzer (called the anti-Titan cannon in the series, but its actual design is based on it). However, a problem arises here: Attack Titan's technological background is World War I, while the American M2/101 howitzer was only introduced to the market Second Shinobi World War.

Furthermore, members of the Marley Public Security (similar to a police force) used Type 71 rifle to attack Eren Kruger's "Attack Titan," which was clearly ineffective. Gabi Braun is currently attempting to snipe "Eren Yeager" with a Lee-Enfield rifle, intending to kill Eren to avenge her friend. However, this rifle has not yet had a chance to fire a single shot, although it did kill Sasha in chapter 105. In addition, the Marley military used Mosin-Nagant rifles against the Survey Corps, but without much effect. Later, the Marley survey fleet that landed on Paradis Island used Mauser military pistol and M1891 Mosin-Nagant rifles. Reiner also used a Mannlicher- Carl M1938 rifle when he attempted suicide (Reiner used round-nosed bullets when he attempted suicide; pointed bullets were invented in the late 19th century and were already widespread during World War I). In addition, the Marleyan military also equipped the internment camp with Krupp 105 mm howitzer and M1938 122mm howitzers to attack the Attack Titan.

In Zeke's flashback, the equipment used by the trainee soldiers follows the era's setting. We see M1895 Steyr-Mannlicher rifles used by the trainees on training missions, fitted with M9 multipurpose bayonet to enhance firepower, and some soldiers assembling M77 rifle. When arresting the Grisha Yeager couple, the police officers also used some Smith & Wesson M29 revolvers. The flashback also shows police officers driving Chevrolet 490 to take the Jaeger couple to the police station.

Marley Public Security

In chapter 89 of the original work, the Marley Public Security (whose name was not mentioned) appears in Ymir's flashback and uses the Martini-Henry rifle as its primary weapon.

In addition, Eldian warrior candidates in the internment camps were trained with Mauser rifles, and Marley Public Security officers used M1917 revolver when Eldian Restorationists were arrested. Most of the guns were fitted with bayonets or daggers.

The Marley security forces (whose name is not mentioned) featured in the anime use the Brown Bess and Charleville musket as their primary weapons.

In chapter 117 of the original manga, during the attack on Paradis Island Eldia Wall Maria, the Marley troops used M1 Garand rifle captured from the Mid-East Allied Forces and M2 Browning heavy machine gun mounted on their airships as their main weapons. Some paratroopers also carried M1 Carbine as a backup. For heavy weapons, they used Mauser M1918 anti-materiel rifle. Strangely, apart from a few members equipped with PTRD-41 anti-tank rifles and German PzB38/39/41 anti-tank rifles (called anti-Titan rifle in the series, but their actual design is derived from this), no explosive weapons were seen. However, in chapter 118, Magath used an American M-114A1 howitzer to hit the Beast Titan. In chapter 119, a PTRS-41 anti-tank rifle hit Eren.

In chapter 130, the Marleyan military used sFH 18 howitzer to bombard the Titans inside the walls. In addition, the Majestic-class battleship and Bayern-class battleship battleships also bombarded the Titans inside the walls, but none of them had much effect.

During the great battle against the Middle Eastern Allied Forces, Marley soldiers piloted Zeppelin airship to deploy the Eldian Titans. Furthermore, after Eren's attack on the containment camp, Marley rescue forces arrived in Ford Model T to transport troops for the rescue. Additionally, East Army dreadnoughts fired upon the Beast Titan. The battle revealed that the navy destroyed by the Colossal Titan primarily consisted of British Kent-class heavy cruiser, Invincible-class battlecruiser, and Russian Imperator Nikolai I-class battleship. In Magath's flashback, the survey fleet also included Italian Pisa-class armored cruiser. Furthermore, the first and second survey fleets sent to investigate Paradis Island were entirely composed of the Russian-made Rurik-class armored cruiser. Additionally, Zeke's flashback showed the American-made Kentucky-class battleship and the Japanese battleship Mikasa.

In Grisha Yeager's flashbacks, he recalls members of the Security Service escorting Eldians to Paradis Island using the Clemont steamship, which was ultimately destroyed by the Titan-transformed Kruger. Furthermore, in his childhood, Grisha Yeager and his sister Fie left the asylum to watch the Macon airship. Also, in chapter 93, the Challenger steam train transports Marleyan military to the capital. In chapter 134, the Marley air force uses all the Hindenburg airship for a final attack.

Exceptions can be found in Grisha's book, where the Marley forces used the Italian Garp Ca.30 bomber, the British Roe IV Triplane, and the American-made Virginia-class armored battleship (also known as the Cairo ironclad).

In chapter 130, in an effort to prevent the tens of millions of Colossal Titan from landing inside the walls, a joint fleet from the world was formed to launch an expedition against the titans inside the walls, bombarding them but to no avail. During the chaotic battle, various navies (due to the presence of warships from other countries) were seen using Super-dreadnought battleship, Deutschland-class armored ship, and Borodino-class battleship. During the bombardment Radetzky-class battleship, Lord Nelson-class battleship, and the Kronprinz battleship were also seen, but they were all destroyed by the Colossal Titan.