Grigorij and Lidka got ambushed in the castle. After being rescued by following tank crew, the soldiers discovers enemy's plan. New recruit, Tomek, saves the day.
In found POW Sgt. Kalita recognizes his former commander. The officer wants to join cavalry despite suffering over 5 years of imprisonment. Colonel sends Rudy unit to find out Germans' plan.
Entraped "Rudy's" crew resists increasingly stronger enemy forces. Upon appointed signal they try to blow up the dam but nothing happens. It turns out their prisoner, Kugel, cut the cable.
While taking a walk, Janek and Marusia were ambushed by SS. Being rescued by others, they found German prisoner of ammo plant. Colonel gives the crew new tank and orders to attack concentration camp and release the prisoners.
When Gustlik visits Honorata, house is surrounded by Germans. Both escapes but the car breaks down. Gustlik sends Honorata to call reinforcement. Gustlik fends off Nazis with the last strength.
The crew uses Szarik's help to plant demolition charges along the tunnel. The plan comes together, but Szarik failed to place detonator. Surprisingly Tomek comes back with handcar.