I was standing on the first floor

The troops are going to take the square. Follow your tanks around the corner and you are attacked by the Germans in 3 dimensions, with great difficulty you destroy the enemy and rush through. Immediately, you will have to fight to occupy the square. First go to the northwest corner and find Sergeant Antonov, he asks you to cover him and go to the southwest corner to find a communications officer to blow up the two rotten carriages in front of him so that the Soviets can get through, once you have succeeded. Once you have managed to get there, the comms officer will call in the engineers, who will come out from the south in front of the even, with a blue balloon on their heads, easily recognisable.