The Struggle for Trost arc

The Struggle for Trost arc (トロスト区攻防戦弧) is the third story arc of the Attack on Titan anime.

Introduction
Shortly after their graduation, the members of the 104th Cadet Corps are suddenly forced into a fight against the Titans as the Colossal Titan appears at Trost District and breaks through the Wall. During the battle, Eren Jaeger learns of the mysterious power deep inside him.