I've always been a fan of the trope where, in a world where superior strength is so common that it starts to lose its luster, disputes are then settled through war of words. GATE's senate summons, Overlord's Empire visit, and Youjo Senki's ep12 are prime examples of that trope done excellently.
Given that the Mato Defense has two unbeatable commanders in their midst, perhaps this mind game subterfuge decision-making truly is the way to go story-wise.