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The Trost District (トロスト区 Torosuto-ku?) is a town located on the south edge of Wall Rose. Because Trost is the town closest to the breach in Wall Maria, it is the town that most frequently comes under attack from Titans.
Five years after the fall of Wall Maria, the Colossus Titan appears again and breaks down the outer gate, causing the district to be invaded by Titans. Eren makes an attempt at killing the Colossus Titan, but it vanishes before he can reach its nape. After regrouping with the other trainees, he finds out they were too scared by the Titan to help him attack.
After the breach, the trainees engage the Titans in the district, resulting in huge casualties to the Garrison. Notable deaths include Thomas Wagner, Mina Carolina, Nac Tias, Mylius Zeramuski, Franz Kefka, Tom, Ian Dietrich, Marco Bott, and Mitabi Jarnach, among others. However, the entire civilian populace successfully evacuated in the hours immediately following the breach, thanks to the efforts of soldiers such as Mikasa Ackerman. This is also the district in which Eren Yeager and the other trainees discover his mysterious Titan-shifting ability. This prompts the Garrison, under the command of Dot Pixis to devise a plan to seal the breach using a large boulder. The district is saved when Eren changes into his Titan form and successfully blocks the breached gate with the boulder. Soon after, the Survey Corps arrive and aid the Garrison in clearing out the remaining stragglers.
Two months after Historia is crowned, Hange Zoë, with the help of Eren's hardening powers, builds a device that can kill Titans without exposing soldiers to them. It is built on the sealed gate and works similar to a guillotine, smashing the Titan's nape with great force.
- It is rather ironic that Trost comes under Titan attack the most, since "Trost" means 'solace' or 'comfort' in German.