I see they put out a v2 of episode 3's subs, which might explain why I struggled to follow the plot this episode.

So the empress girl wants to embroil Wein's backwater country in her succession dispute to avoid facing the matter head-on? And because he told her to do so if she ever needed help? That's kind of strained, but will make for a 'too cool for school' moment later so I hope it's worth it.