While the history of Caesar is well documented, on this site and other sources, his contribution as an author is of immense historical value. Caesar meticulously tracked his own campaigns in Gaul and in the Civil War, not only for the historical record, but as propaganda against his political enemies. With his deeds in writing, and available for the populace, the Senate found it impossible to attack Caesar's popularity with the common people.
Aside from an account of his campaign, "The Conquest of Gaul" is one of the few primary source pieces of literature regarding the tribes and customs of Gallic Celts. The Civil War provides additional in-depth, though biased, analysis of this turbulent time in Roman history.
Bellum Gallicum (Gallic Wars, or Conquest of Gaul)
Bellum Civile (The Civil War)