The Battle of Breitenfeld was fought at the crossroads village of Breitenfeld near the walled city of Leipzig on September 17, 1631 (N.S.). Under the leadership of King Gustavus Adolphus of Sweden, the Protestant forces, which had previously been steadily and systematically defeated, achieved their first major victory during the Thirty Years' War. Afterwards Gustav II Adolf became famous and known soon thereafter as Gustavus the Great. The key outcome was that it ensured that the Germanies would not be forcibly converted to Roman Catholicism or remain subject to the Holy Inquisition— that Gustavus had all but destroyed a Catholic field army (for the first time in over a century).