The Helvetian Affair: Book II of the Gaius Marius Chronicle by Ray Gleason
The Helvetian Affair is the second book of the Gaius Marius Chronicle, the memoir of a retired Roman soldier, Gaius Marius Insubrecus, a legionary who fought with Caesar throughout his Gallic campaigns and the Roman civil wars.
The Helvetian Affair recounts Insubrecus' coming of age as a Roman soldier in the legionary camps outside the city of Aquileia, and serving his patron, Caesar, as he conducts a lightening campaign to prevent the fierce and ruthless attempt by the Helvetii to conquer Celtic Gaul and threaten the Roman province.
The narrative recreates a colorful and culturally complex portrait of ancient northern Italy and the Rhone valley, as Romans, Celts and Germans struggle for supremacy in the hills and dark forests of western Gaul.