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Irisdina introduces Lise to the squadron, to the shock of Theodor, who cannot believe he's been reunited with his sister after being separated three years ago. Irisdina and Gretel express concern Lise may have been brainwashed, sent as a spy against the National People's Army and the 666th specifically. Irisdina orders Theodor to figure out what Lise is up to. During a training exercise, they meet up with European Union forces, and join an operation to retake BETA-held territory in the former Poland with the goal of expanding a beachhead near Gdańsk.

In the recaptured Gdańsk base, West Germain Huckebein battalion leader Circe Steinhoff berates the Schwarzesmarken for needing to be rescued. She gets into a fistfight with Annett, which is broken up by Katia. Irisdina reveals to Theodor and Katia that the whole reason for the joint mission is to improve the military's stature relative to the Stasi, which explains Gretel's obsession with appearances. Facing a second wave of 40,000 BETA, the Warsaw Pact forces plan a response that will put the 666th in the greatest danger, but will also prove their mettle compared to the EU and US' conservative tactics.

Back at base, Gretel and Irisdina grill Theodor about Lise's loyalties, and he asserts that she's loyal to him and not a Stasi plant. They also reveal that with the activation of a BETA hive in Minsk, East Germany will soon be overwhelmed with a new BETA assault. Along with all of this, the Stasi is on the verge of taking over the military, having arrested many NPA officials. Axmann arrives with a TSF squadron, briefly arresting Irisdina for "counterrevolutionary statements" during the earlier battle, and accusing Lise of being a Stasi spy.

The BETA assault from Minsk is worse than expected, with 200,000 BETA headed towards Fort Seelow, where the army will make its final stand to protect Berlin. With doubts about Lise growing in the squad, Theodor asserts her innocence to Irisdina, and acknowledges he has begun a sexual relationship with Lise, his adoptive sister, in order to keep an eye on her. The BETA overwhelm artillery forces with the Heavy Laser-class, and the 666th is sent to engage them.

Theodor and Katia escape the base, leaving the rest of the squad captured by Lise. In Berlin, where the Moscow faction of the Stasi has beaten Axmann's Berlin faction, Schmidt takes control of the government, vowing to unite all military forces under the Stasi. Beatrix arrives at Bebersee, where she re-inducts Lise to the Stasi's Werewolf battalion, and orders Lise to interrogate the captured members of the 666th. Katia and the dejected Theodor escape into the woods, where they are rescued by Gretel, who is now working with a resistance organization.

General Heim accepts Katia as a figurehead of the resistance and plans an attack on the Stasi in Berlin. At Bebersee Base, Lise oversees the interrogation of the captured members of the 666th. Theodor and Gretel lead the rebels in an attack on Bebersee to free the captured members.

The West German government takes note of the Stasi coup d'etat and is prepared to recognize them as the new government, only so that the East will hold the line against the BETA. Circe heads to the east to rendezvous with the rebels, hoping to bring back some proof they can win. Lise, now embedded with Borkewald squadron, attacks the leaked location of a rebel leadership meeting in Neuruppin.

Attempting to return to Berlin, the 666th and their resistance allies are met by Werewolf Squadron at the Havel River. Gretel is shot down, but is found by Axmann, who invites her to join his Berlin faction in the internal Stasi rivalry against the Moscow faction.

The rebels take over Berlin's broadcast tower and escort Katia inside. The 666th and the rebels engage Werewolf squadron over the streets of Berlin. During the battle, they hear Katia's speech, revealing herself to the nation as Usula Strachwitz, and appealing for the people to rise up against the Stasi.