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.
Let's sing them a pretty song, then.
دعونا نغرّد لهم بأغنية جميلة إذًا
Dann zeigen wir ihnen
unseren schönsten Gesang.
Entonces, cantémosles 
una buena canción.
Entonces, cantémosles 
una buena canción.
On devrait alors leur montrer
notre plus beau chant.
Allora facciamo sentire la nostra bella voce!
Então cantemos uma bela canção.
В таком случае давайте споём им.