The Proof House

The gripping, hugely entertaining conclusion of K. J. Parker's Fencer Trilogy. After years spent in the saps under the defenses of the apparently impregnable city of Ap'Iscatoy, Bardas Loredan, sometimes fencer-at-law and betrayed defender of the famed Triple City, is suddenly hero of the Empire. His reward is a boring administrative job in a backwater, watching armor tested to destruction in the Proof House.
But the fall of Ap'Iscatoy has opened up unexpected possibilities for the expansion of the Empire into the land of the Plains people, and Bardas Loredan is the one man Temrai the Great, King of the Plains tribes, fears the most.