Caught between the France of Henri III, the Empire of Philip II of Spain and Reformed Switzerland, Charles-Emmanuel Ier Duke of Savoy tries to extend his domination by all means. From hazardous maneuvers to military failures, he turned his back on the whole of Europe and had to face the King of France, Henri IV and his most famous lieutenant, the Duke of Lesdiguières. This military campaign (1597-1601) will lead to the attachment of Ain to France, by the Treaty of Lyon. Beyond the two clashes, this book is an opportunity to browse a page of the history of Europe in the 16th century.e and XVIIe centuries.