Jugurthine War
The Roman historian Sallust wrote a monograph, "Bellum Jugurthinum", on the Jugurthine War emphasising this decline of Roman ethics and placed it, along with his work on the Conspiracy of Catiline, in the timeline of the degeneration of Rome that began with the Fall of Carthage and ended with the Fall of the Roman Republic itself. Sallust is one of the most valuable sources on the war, along with Plutarch's biographies of Sulla and Marius.