0. Thomas De Quincey's Introduction to Caesar's De Bello Gallico & Other Commentaries
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"De Bello Gallico" and Other Commentaries by Gaius Julius Caesar is licensed Public Domain in the USA. Translated by McDevitte, W. A. (William Alexander). Intro by De Quincey, Thomas.
The context for this commentary is that in the time of Caesar's youth, the Dictator Sulla had recently overthrown the dictator Marius. Caesar was ostensibly deemed to be at opposition to Sulla, but managed to escape his political purge.