In 1608, German states formed a defensive union that set the stage for religious war
Tensions between faiths reached a breaking point in 1608 when German princes formed a military alliance, inadvertently setting the stage for one of Europe's deadliest and most transformative conflicts.
In May 1608, the Protestant Union was established under the leadership of Frederick IV to defend the rights and lands of Protestant states within the Holy Roman Empire. This defensive pact was a direct response to rising religious friction and the forceful reclamation of territories by the Catholic Church.
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