Ogres doesn't leaving Stalwart

[Xenomorf]

I tried to get "The ultimate achievement". After the first visit to Stalwart you need to kill Darzir and stop the ogre invasion, and i almost complete the task, but leaving two cannoneers alive, because my hp was extremely low. So i went to the Caed Nua, rest a bit, came back, heared "Darzir has fallen..." on loading screen and... nothing more. Ogres still in the village, i can't go further, because Darzir already killed.
There is a something i can do?

Here is the save file: https://drive.google.com/file/d/17ICQZ0unG3HPc_S-c-xezEgLm0wzxGXw/view?usp=sharing

Edited August 21, 2019 by Xenomorf