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.
So you kicked the enemy's ass
from behind, huh?
إذًا فقد هزمتَ العدو من الخلف؟
Ihr habt den Feind
von hinten in den Hintern getreten.
Así que patearon 
al enemigo por detrás, ¿eh?
Así que patearon 
al enemigo por detrás, ¿eh?
Alors comme ça, vous avez frappé
l’ennemi par derrière…
Un bel calcio nel sedere per il nemico, eh?
Então arrebentou mesmo 
com o inimigo pelas costas?
Значит, вы решили залезть с заднего двора?