'Calvinism's First Battleground' offers a comprehensive analysis of the origins of Calvinism and the Reformed faith by examining the Reformation in the Pays de Vaud in detail. The book highlights the specific conflicts that led to the emergence of a Calvinist identity and theology. These conflicts included resistance to Catholic practices and engagement with the prevailing Zwinglian political and theological ideas in Switzerland. The Pays de Vaud region played a central role in these disputes, as it was politically under the influence of Zwinglian Bern, while many of its ministers were strongly influenced by Calvin. Calvin himself was initially optimistic about the possibilities for reform in the region but increasingly turned to France as tensions with the Swiss escalated. This historical analysis provides valuable insights into the broader developments of the Reformation in the French-speaking world and its impact on the forthcoming religious wars.