It's fine that she's an expert in medicine, but did they have to make her a genius war tactician as well?
She has almost no training, except for knowing some select past events. There should be no way she's outmanouevuring the enemy tactician and even doing better than the prince.
They didn't make her a tactician? She's literally just remembering her past life and the shit people did then, like you said yourself. The second anything changes too much from then, she'll have nothing to offer except medical advice. The reason she could get the upperhand in this chapter is pretty simple. Nobody expected her to know how to use a gun except us and her older brother. I don't think any of her friends or colleagues know that she knows how to shoot.
Which idiot goes in himself first. She could have easily had a guard hidden or something.
This idiot, who has been behaving erratically since he was hit during the retreat from his second plan to get foiled by some girl who shouldn't be outsmarting him in battle (and who actually wasn't doing so, as addressed already). He committed a war crime specifically to get back at her, you think
this is the part where he got stupid?
I'm not going to pretend this series has exceptional writing all the time, if ever. It's isekai/tensei garbage, I've lowered my standards ahead of time. If you've gotta pick at it, do a better job so I don't have to pick at you.