The Conquest of Gaul
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Caesar's well written notes on his encounters with Gauls, Germans and Britons during 58 to 51 BC, partly for the sake of history, partly to buy influence from supporters back in Rome, and partly to say how good the Roman army was and get them behind him.
This is a very good and readable translation by S.A. Handford, with an overview of Roman politics, the army, the situation in Gaul, and notes on Caesar before the book starts. The notes at the back bring certain parts of each chapter under the spotlight and there's a handy glossary of people and place names.