The Empire is launching a seemingly foolish attack on the Entente Alliance in the middle of winter.  They lack the supplies to successfully invade.  Tanya realizes that this attack is a feint intended to distract from a fjord landing mission.  Sure enough, she is sent to lead the invasion of the fjords, and silence 20 cannon emplacements in time for the fleet to land and the Imperial forces to disembark.
That's exactly why we adults 
have to keep fighting, too.
ممّا يعني أنّ علينا نحن الراشدون أن نواصل القتال أيضًا
Und genau deshalb …
Así que los adultos también 
debemos seguir peleando.
Así que los adultos también 
debemos seguir peleando.
C’est pour ça…
È proprio per questo
Logo nós, adultos, também 
temos que seguir na luta.
А значит, мы, взрослые, уж точно 
не должны отсиживаться в безопасном месте.