The Other Side of the Ocean

is the 1st chapter of the 23rd volume and the 91st chapter overall of the Attack on Titan manga, written and illustrated by Hajime Isayama.

Summary
It is the year 854, Marley has been at war with the Mid-East Allied Forces for four years, and as a result, has been forced to put its mission to retrieve the Founding Titan from Paradis on hold. The Marley fighting force consists largely of Eldians under the command of Marleyan officers. In order to finally win the war, Marley's forces intend to capture Fort Slava, which will allow them to invade the port where the Mid-East Allied Forces' fleet is currently residing, and destroy it.

A young soldier named Falco is injured on the battlefield, and has to be carried to safety by his brother Colt. Arriving in the safety of a nearby trench, Falco's comrades begin giving him first aid as Colt reports to his superior, Commander Magath. Colt reports that digging another trench will be impossible due to artillery fire, but his superior is unwilling to listen to him.

As Falco receives medical attention, one of his fellow soldiers, Gabi, reminds him of their mission to capture the Fort. Falco asks why they cadets, are fighting on the front lines, and Gabi explains that they are being tested to see who will become the next warrior. The battle is being used to determine who will inherit Reiner Braun's Armored Titan. Fellow cadets Udo and Zofia muse that Gabi will most likely be chosen, due to her high scores, but Gabi insists that her scores are not the reason she will be chosen. She will be chosen because of her determination to exterminate the evil Eldians living on Paradis, and prove that the Eldians living in Marley are good.

Colt informs Magath that the soldiers will not have the power to destroy the Fort's rail tracks, and that if they do not move soon, they will be wiped out by artillery fire. When Magath asks if he has an idea, Colt suggests releasing their two warriors Galliard and Pieck. Magath rejects the idea, not willing to risk using two warriors yet. As the two are discussing, another soldier informs them that the Fort is bringing out the Mid-East Allied Union's new weapon: the Anti-Titan Cannon, a cannon that can kill any Titan, including one of the nine original Titans, with one shot. Colt argues that Galliard and Pieck's Titans are fast enough to evade any shots. Magath, unwilling to risk losing more Titans after the loss of the Colossus and the Female, orders the soldiers to prepare to fight. Colt tries to protest, but Magath stops him, reminding him that he will need to change his attitude if he hopes to inherit the Beast Titan.

As the Anti-Titan Cannon begins to move closer to their position, Gabi asks Magath to allow her to destroy the cannon herself. Although Magath is reluctant, Gabi convinces him to allow her to try her plan, if it will prevent the loss of hundreds of troops. As part of her plan, Gabi takes off her uniform, before leaving the trench.

As Gabi approaches the Fort, two Union soldiers spot her, failing to notice the small bomb she has tied to her ankle. Afraid that might be an Eldian Titan shifter, the soldiers prepare to shoot her, but are surprised to see her collapse on the ground. Gabi waits for the Anti-Titan Cannon to draw closer before throwing her bomb onto its tracks, destroying it. Enraged, one of the soldiers begins firing at her.

Falco, seeing Gabi is in trouble, leaves the trench to stop her, to Colt's horror. However, as he reaches Gabi, Galliard appears on the battlefield, using his Titan to physically shield the two from fire, before charging forward and destroying the outpost the two Union soldiers are in.

Trivia

 * Isayama drew a new picture while watching UFC a few days earlier before the release of this chapter. It seems to resemble the character Gabi and from the katakana being the same or similar in spelling.