The book "The Thirty Years' War, 1618-1648" was written by the historian Samuel Rowson Gardiner and is an important source for the study of one of the most destructive conflicts in European history. The author examines in detail the causes, events and consequences of the Thirty Years' War, which began as a religious conflict between Catholics and Protestants, but quickly turned into a confrontation between major European powers for influence and power. Analyzing political changes, military campaigns, and the general impact of war on society and culture, Gardiner recreates the complexity and tragedy of the events of the time. This book is not only an important document of history, but also a reliable source for anyone interested in the period of the Protestant Reformation and the wars for religious and political power in 17th century Europe.