In 57 BC, after having driven back Helvetii and Germans, Julius Caesar gradually imposed the presence of his legions in the heart of Gaul. Taking advantage of the dissensions between the Gauls, he manages to forge alliances with certain tribes and makes himself indispensable in these fratricidal struggles. The Battle of the Aisne is a major historical event in this Gallic War. It sees Julius Caesar and his allies, Rèmes and Aedui, oppose a coalition of fifteen Belgian Gallic tribes. Thanks to the author's research, this book also puts a definitive end to the controversy over the two main sites of this battle of the Aisne. The topographical description lying in the pages of Caesar's Commentaries, however, appeared sufficiently clear to precisely locate the Roman camp on the Mauchamp hill and the Bibrax oppidum of the Roman Gauls on the site of "Vieux-Laon".