The secret mission: The protagonist is once again need to choose between his honor and duty. In a nutshell, the Protagonist will need to raid a vital location to provoke the enemy to take the first move. The raid, however, does not sit well with the protagonist, as he sees it as dishonorable...
EXCEPT it is by no mean dishonorable or against the article of war. First, the fortress is swarming, yes, swarming with hundreds of Church Hussar as garrisons, the key targets, Princess Anna and Lady Aleksandra, are not unarmed civilians but Prince Khorobirit's wife and daughter who both know how to fight. Even in real life, attacking such key location is considered a clever tactical move, and the Geneva Convention suggests that no war crime is committed between two parties who are armed and ready to fight each other, so why is Protagonist is nagging and feeling guilty about it?
Regardless of who you face in that camp, the fact remains that this isn't the typical "soldier vs soldier" fight on the battlefield. All this time, any battle that is fought and won is a victory that achieved through your own leadership and prowess alone. Now, by attacking the enemy's loved ones, you are intentionally dealing him an emotional blow to cause Khoroborit to make a fatal mistake, in order to secure a win for the army. However, such a victory is no longer achieved due to your own effort and skill, but rather due to the simple fact that you were fighting an enemy that was not at his best.
Further, the dragoons believe in the idea of Saints, and Sainthood is achieved by perishing while performing an act of great heroism on the battle. Would you call murdering two noble women simply because they are Khoroborit's family a "heroic act"? (Of course, it's likely that only a merciful MC will feel this way; ruthless ones probably won't care much for it.)
I also find it funny that Tierran bring along their wives to the Antar. How can anyone risk the life of his family to the frontline of raging war? In my book, bring family members with you means not taking the war seriously, and armies that are not being serious about war don't end up well in real life. Or is it a Calligian culture that I do not understand?
Camp followers are a concept as old as war itself - especially for a setting based on Napoleonic-era warfare. Prior to World War I, battles were somewhat "civilized,' in the sense that the logistical and technological limitations on armies didn't allow for protracted, active battles that are now the norm. The previous status quo was armies spending weeks or even months just maneuvering for optimal position in a battle that would rarely last longer than single day. This is doubly true for wars of occupation - even now, with instant global communications, family members will accompany soldiers deploying to "safe" forward bases (such as the British in Colonial India, or the US in Korea).