While the official goal of the 57th Expedition was to secure a route to Shiganshina, Erwin’s true motive was a high-risk gamble to flush out a spy hiding within the military ranks.
Realizing she is cornered, the Female Titan lets out a unique, deafening scream that attracts every Titan in the vicinity. 20 : Erwin Smith: 57th Expedition Beyond the Wa...
The expedition is ultimately called off as a failure due to the high casualties and the escape of the spy. The episode ends on a tragic note as the cloaked mole, still hidden among the Scouts, ambushes Levi’s squad and kills Gunther Schultz, setting the stage for the devastating battles to follow. 57th Expedition Outside the Walls | Attack on Titan Wiki While the official goal of the 57th Expedition
Erwin intentionally used Eren Yeager as bait to lure an intelligent Titan—later revealed as the Female Titan—into a trap. The episode ends on a tragic note as
The episode focuses on the tense moments after the Female Titan is lured into the Forest of Giant Trees and restrained by the Survey Corps ' special target restraining weapons.
Despite being pinned, the Female Titan hardens her skin, preventing Levi and Miche from cutting out the human pilot.
Erwin's willingness to sacrifice hundreds of soldiers for a chance at capturing the enemy proves that for him, the only way to defeat monsters is to rise above humanity's limitations. Aftermath and the Cost of Failure