Insurgent

Tris explains her plan to the Erudite refugees. Cara and Fernando agree to help by using their technical skills to broadcast the secret information once they locate it. They also donate some technology, including glass shattering discs and a stun-gun.

The attack is scheduled to begin that afternoon, so those who are willing to join the fight meet and get into Amity trucks for the journey into the city. They find the gate open, with no guards in sight.

As they approach Erudite headquarters, they hear gunshots. Tris arms herself with a stunner, and they look for a way into the building. 

Finding the Erudite headquarters guarded by Dauntless under a simulation that responds only to sound, they enter using a ladder from an adjacent building, passing over through windows three stories up. Fernando is shot and killed when his glasses fall off.