To survive in Marley, the Scouts utilized several specialized strategies:
In conclusion, the undercover mission to Marley is the defining arc of the Survey Corps’ maturity. It stripped away the last vestiges of the "fight against Titans" fantasy and replaced it with the grim reality of geopolitics. The Scouts who left the shores of Paradis were warriors fighting for a future; the ones who returned—those who survived the ensuing global war—were haunted ghosts. They proved that to fight a devil, one must sometimes live in the devil’s shadow. Their undercover work did not bring about peace; it delayed extinction. Yet, in the brutal calculus of Attack on Titan , that delay was the only victory possible. They looked into the abyss of Marley, and they brought back the truth—however devastating it was. scouts that went undercover in marley
Eren Yeager’s infiltration was the most successful and psychologically taxing. He separated from his comrades during their initial diplomatic mission to the Marleyan mainland, disappearing into the shadows of the "enemy" territory. To survive in Marley, the Scouts utilized several
Armin remained largely offshore until the moment of the raid, but his role was the ultimate "undercover" ace. They proved that to fight a devil, one
The climax of the undercover effort was not a quiet retreat but the Liberio Raid. Having gathered enough intelligence, the Scouts facilitated Eren’s attack on the Marleyan military festival. This act was a strategic gambit to cripple Marley’s command structure and devour the War Hammer Titan, but it was also a moral point of no return. By infiltrating Marley and then striking its civilian district, the Scouts committed an act of terror from Marley’s perspective. They transformed from underdogs into global aggressors. The mission’s tragic irony is that the Scouts succeeded too well. They brought back the information needed to save Paradis, but in doing so, they lost their moral clarity. The mission fractured the corps: Levi remained a soldier focused on survival, Hange was tormented by the ethics of the raid, and Eren became the very monster the world feared.
Beyond raw data, the mission sought to understand the "humanity" of the enemy. In a poignant parallel to the Scouts’ own past, Eren Yeager—who joined the mission under a fake identity—witnessed the Festival of the Liberio Internment Zone. He saw Eldians in cages, forced to wear armbands, and children being indoctrinated to hate their own heritage. Through the eyes of the Scouts, the narrative reframes the conflict. The enemy is not a monolithic evil; they are a society drowning in fear and historical grievance. This realization shattered the simplistic "us vs. them" mentality. However, it also hardened Eren’s resolve. While Armin Arlert marveled at the sea’s beauty and the irony of a shared world, Eren saw the "other side of the ocean" as an enemy that wanted his home erased. The undercover mission, therefore, served as the catalyst for the series’ central ideological fracture: the conflict between negotiation (Armin/Hange) and preemptive annihilation (Eren).