1984’s Endurance is the third volume in Yoshiki Tanaka’s MilSpaceOpera manga series, Legend of the Galactic Heroes. The 2016 English language edition was translated by Daniel Huddleston.
Two civil wars have ended; both the Galactic Empire and its deadly enemy, the Free Planets Alliance, are at peace. Reinhard uses the respite to consolidate his control over the Empire, becoming Emperor in all but formal title.
The FPA uses peace for an entirely different purpose.