Gustavus Adolphus and the Struggle of Protestantism for Existence is a historical book written by C.R.L. Fletcher. The book explores the life and reign of Gustavus Adolphus, the King of Sweden, and his role in the Thirty Years War. The author also sheds light on the political and religious landscape of Europe during the 17th century, with a particular focus on the Protestant Reformation and the struggle for religious freedom. The book covers Gustavus...