As reported in a previous piece the Bohemian Brethren who would later become the Moravians were involved in the 1618 Protestant plot to install Frederick V of the Palatinate on the throne of Bohemia. The Habsburgs responded, defeated the Utraquist-led Protestant forces and launched a vicious Counter-Reformation that would almost eradicate Protestantism in Bohemia. Though minor players and a minority within Bohemian Protestantism, the Brethren would suffer severe persecution. The war soon expanded and would become the Thirty Years War enveloping much of Central Europe. After the Habsburgs had scored tremendous victories and seemed poised to win the war - and roll back Magisterial Protestant gains from the previous century, the Swedes invaded under Gustavus Adolphus in 1630 - landing in Pomerania. The tide would quickly turn.