Stretching from 1625-1629, the Danish Period started after Bohemia was defeated. protestant countries were beginning to realize the danger that they face. The king of Denmark, Christian IV(Protestant), helped by several other countries, opposed Ferdinands forces at Saxony. The Emperor Ferdinand recieved uexpected aid from General Albrecht Wenzel Eusebius von Wallenstein, whose army was composed of hired soldiers and adventurers.
Wallenstein's forced, aided by the Holy League forces under General Tilly, defeated the Danish king again and again. Christian IV eventually signed the Treaty of Lubeck(1929) and withdrew from Saxony. Emperor Ferdinand issued the Edict of Restitution, a documents stating that all church possessions the Protestants obtained were to be returned to the Catholic Church.The Edict was a new source of friction in Germany.