his enemies before they had become too strong for him. The Danish armies marched into Germany but were defeated. Wallenstein followed up his victory with such energy and violence that Denmark was forced to sue for peace. Only one town of the Baltic then remained in the hands of the Protestants. That was Stralsund.
There, in the early summer of the year 1630, landed King Gustavus Adolphus of the house of Vasa, king of Sweden, and famous as the man who had defended his country against the Russians. A Protestant prince of unlimited ambition, desirous of making Sweden the centre of a great Northern Empire, Gustavus Adolphus was welcomed by the Protestant princes of Europe as the saviour of the Lutheran cause. He defeated Tilly, who had just successfully butchered the Protestant inhabitants of Magdeburg. Then his troops began their great march through the heart of Germany in an attempt to reach the Habsburg possessions in Italy. Threatened in the rear by the Catholics, Gustavus suddenly veered around and defeated the main Habsburg army in the battle of Lützen. Unfortunately the Swedish king was killed when he strayed away from his troops. But the Habsburg power had been broken.
Ferdinand, who was a suspicious sort of person, at once began to distrust his own servants. Wallenstein, his commander-in-chief, was murdered at his instigation. When the Catholic Bourbons, who ruled France and hated their Habsburg rivals, heard of this, they joined the Protestant Swedes. The armies of Louis XIII invaded the eastern part of Germany, and Turenne and Condé added their fame to that of Banér and Weimar, the Swedish generals, by murdering, pillaging and burning Habsburg property. This brought great fame and riches to the Swedes and caused the Danes to become envious. The Protestant Danes thereupon declared war upon the Protestant Swedes who were the allies of the Catholic French, whose political leader, the Cardinal de Richelieu, had just deprived the Huguenots (or French Protestants) of those
