From the announcement:
No Surrender, an adventure supplement for Only War is now on sale at your local retailer, and through our webstore.
In No Surrender, guardsmen serving in the Spinward Front must face the secessionist traitors, the Severan Dominate, whose forces have taken over the Lycurgos star fort, and are using it as a base for their treacherous deeds. In No Surrender, an expanded, three part adventure, you and your unit of guardsmen must work to reclaim this star fort for the Emperor!
Lead Developer Tim Flanders previews the dangers that await in No Surrender!