Victory of Alexios I over Pechenegs, who were converted (concealment of brutal details)

Summary:
[There are some signs that later historians tried to suppress the details of the brutal battle against the Pechenegs and the massacre which followed.] The Pechenegs were unable to resist the army of Alexios I and appealed for mercy. Many perished and the rest were captured and enslaved, like those he settled in the theme of Moglena with their wives and children and constituted them as a special regiment. They remained there to the time of Zonaras, and were called the Moglenite Pechenegs 
Dates:
1091 (untrue) 
Emperor Alexios I Komnenos (Alexios 1)
  • Campaigned against the Pechenegs who were pillaging Thrace and Macedonia, and his troops were first defeated but then won a decisive victory (:) Glykas 620.18-621.2
  • Selecting a multitude of the strapping and vigorous [Pechenegs], he settled them in the theme of Moglena with their wives and children and constituted them as a special regiment. They remain there to this day and are called the Moglenite Pechenegs (:) Zonaras 18.23.6-7
  • Set out again against the barbarians, his army humbled and depending entirely on divine intervention, and attacked the [Pecheneg] enemy. Unable to withstand the assault they appealed for mercy. Many perished and the rest were captured and enslaved (:) Zonaras 18.23.3-5