The Thirty Years War, fought from 1618 to 1648, was largely a religious war which was fought between Catholics and Protestants and has gone down in history as one of the most devastating wars in all of European history.
 
 
Recommended Resources
Encyclopaedia Britannica: Thirty Years' War
Delves into the war, the nations which fought in it as well as the reasons they did so, and how that fighting affected the nations as well as the war.
http://www.britannica.com/EBchecked/topic/592619/Thirty-Years-War
History Channel: Thirty Years War
The History Channel offers a look at the conflict that redrew the religious and political map of central Europe, including the people and groups involved, the themes, and specific events.
http://www.history.com/topics/thirty-years-war
History Learning Site: The Thirty Years War
The Thirty Years War is explained, including the involvement of the Holy Roman Empire, North Europe, Bohemia, the Danes, and Sweden, as well as an overview of the Edict of Restitution, the Peace of Prague, and the Peace of Westphalia.
http://www.historylearningsite.co.uk/thirty_years_war.htm
How Stuff Works: Thirty Years' War
Provides a details article about the Thirty Years' War, with sections which address the causes which led to the war, the course of the war, and each of the battles and revolutions.
http://history.howstuffworks.com/european-history/thirty-years-war.htm
Maintained by Chris Atkinson, the site offers an introduction to the Thirty Years War, including a background, the Bohemian phase of the war, the Palatinate phase, Danish phase, Swedish phase, French phase, and the Peace at Westphalia.
http://www.pipeline.com/~cwa/TYWHome.htm
The Australian based Living History group is interested in Europe's Thirty Years War, which took place between 1618 and 1648, and a history of this series of wars is put forward on their site, along with schedules and contacts.
http://thethirtyyearswar.tripod.com/
The Thirty Years' War (1618-1648)
Described as the last major European war of religion and the first all-European struggle for power, the series of wars, fought mostly on German soil, are outlined in this article by Herb Femling.
http://www.femling.com/gen/thirty.htm
This website displays information about both of the wars which are referred to as the "Thirty Years' Wars." The section about the so-named war which lasted from 1618 to 1648 discusses the origins of the conflict, the Bohemian period, the Danish period, the Swedish period, the French period, and the Treaty of Prague.
http://www.thecaveonline.com/APEH/thirtyyearswar.html