Izetta is powerful enough to fight whole armies, but her strength is limited.  She can only use her abilities near certain ley lines, and outside them, she's no different than a normal girl. When the Germanian army attacks in a spot far from these ley lines, the duchy is forced into a corner: how can they repel these foes without giving up the secret of Izetta's strength?
After hearing what he said, I'm sure of it.
بعد سماع ما قالَتْه، أنا واثق
Nach dem Gespräch mit
dem Hauptmann bin ich mir sicher,
Tras escuchar lo que dijo, estoy seguro.
Tras escuchar lo que dijo, estoy seguro.
J’en suis sûr, maintenant.
Dopo aver ascoltato la sua storia,
mi sono convinto
Depois do que ele 
disse, tenho certeza.