During this, the Elites are taken out and the Cadets are brought forward and given a battle plan to follow which doesn't last long due to the Abnormal Titans. Abnormal Titans are Titans which seem to have a few more brain cells than the others and can either run faster, jump from building to building, or can just pick humans off easily.
With the Cadets getting ready to go to battle, Jean starts arguing with Eren, saying how unfair it is that they've been called to battle.
After putting Jean in his place, Eren then argues with Mikasa, who only wants to protect Eren.
After a quick flash-back of a lesson the Cadets had about the weak spot on Titans, the Cadets set out to fight for Trost. After seeing one of his comrades get eaten by an Abnormal, Eren goes into a rage and tries to take out the Abnormal.
Flying through the air, Eren doesn't notice a Titan below him which jumps up and bites the lower half of his left leg, causing Eren to crash into a rooftop and lay there. The rest of Eren's squad gets taken out, leaving Armin alone on a rooftop when a Titan that looks like Santa appears in front of him, picking him up and swallowing him. As Armin slides down the Titan's throat, Eren appears inside the Titan's mouth, grabbing Armin's hand and pulling him out - throwing him onto the rooftop, then reaching out for Armin to pull him out aswell.
Armin doesn't get to him in time and Eren gets his arm bitten off and is subsequently eaten by the Titan.
Episode six begins with Armin being woken by Connie, asking what happened, causing Armin to have a flash back and curse himself for still being alive.
With the Titans being fought, the civilians are still trying to escape but can't as a merchant trader is more concerned about getting his wagon through, holding lots of people up. At this point, an Abnormal Titan runs around the corner in the classic Titan run. Mikasa then appears and takes out the Titan before it reaches the civilians. Mikasa then scares the merchant into moving his wagon and letting the people through, saving lives.
We then see a flash back of Mikasa past when she was with her real parents, and the Mikasa family home gets attacked and her parents get murdered which she witnesses. Eren and his Father show up and find the dead parents, Eren's father goes to inform the MPs about the murder and tells Eren to wait. Eren finds the bad guys in a house where Mikasa is tied up. After killing the bad guys Eren cuts Mikasa free; upon being cut free Mikasa asks about the third guy with Eren didn't know about. Mikasa then has to kill the third one to save Eren.
At the end of the episode, we see Eren giving Mikasa his scarf, which she can be seen wearing throughout the series.
Returning to the battle, we find the Supply Squad are surrounded by Titans and have barricaded themselves in their Head Quarters, leaving the others without gas refills and stranded. After the battle calms down, the cadets are in shock and are gathered on rooftops.
Mikasa finds Armin and asks about Eren, Armin tells Mikasa about Eren's death. This enrages Mikasa, causing her to pep talk the others into taking back HQ. Using her remaining gas too fast, Mikasa falls and crashes, laying there ready to give up.
A Titan finds Mikasa and tries to get her but she fights back, questioning herself as to why she's fighting, but decides it's to keep the memory of Eren alive. As Mikasa goes to attack the Titan, another appears behind her.
Prepared to fight both Titans, Mikasa positions herself ready for battle, when suddenly, the Titan from behind her stamps on the ground, sending her flying and going after the Titan that was after Mikasa. The second Titan goes into hand to hand combat with the first Titan and kills it, destroying its weak spot.
Armin appears and pulls Mikasa to safety. Connie joins Mikasa and Armin on the rooftop and Mikasa gets them to watch the second Titan take on another Titan and kill it as well, while leaving them unharmed.