The bulk of volume 5 details the Dacian front of the war, and it doesn't play out how I expected. In a lot of series, the Dacians would have had some kind of secret super weapon that would have caught Tanya & Co. by surprise, and stolen some of the wind out of their sails. What actually happens is...vastly different than that, instead painting a grim example of what can happen to people if they let greed or ambition get the better of them. And this more realistic take works better, I think.
Once again, Tanya's handling of the situation backfires on her as well. But by this stage, she's stuck in a vicious spiral: Decisive victories aren't doing her any favors, but she can't just suddenly stop being a military genius, because it will either A) get her killed in action, or B) lose her status in the eyes of the higher-ups, and cause even worse problems down the line. And with the end of this volume seeing her achievements earning her barely a moment's rest before getting thrown back into the fray, I'm sure she has even worse trials ahead of her.
All in all, a pretty good volume.