When Does Eren First Transform ((install)) < iPhone >

The Titan invasion of Trost District has left the Scout Regiment devastated. The initial defensive plan to cover the cannon with a boulder has failed, and the surviving soldiers, including Mikasa and Armin, are low on gas and morale. They are cornered by a Titan while trying to climb a wall to safety.

For the first time, the Survey Corps realized they had a weapon that could actually fight back on equal footing. when does eren first transform