Whilst Tilly was conquering Lower Saxony, and Wallenstein made great havoc in Northern Germany, small literature flowed in an under-current. After every engagement, and every capture of a city, there appeared copper engravings, with a text which described the position of the troops and the appearance of the city; irregular newspapers, and songs of lament conveyed the information of the advance of the Imperialists, and the destruction of the Mansfelders. In the midst of all this the people were dismayed by terrible decrees of the Emperor, who now from his secure position threw over the evangelicals, or compelled them by force to return to his Church, in spite of the fruitless intercessions of the Elector of Saxony. The Elector at last authorized the publication of a defence of the Augsburg confession, against the attacks of the Catholic theologians; this comprehensive work, called, 'The necessary Defence of the Apple of the Eye,' written in 1628, called forth immediately a theological war; both opponents and allies hastened in crowds to the field. 'Spectacles for the Evangelical Apple of the Eye;' 'A sharp round Eye on the Romish Pope;' 'Who has struck the Calf in the Eye? The Catholic Oculist or Coucher;' 'Venetian Spectacles on Lutheran Nose,' &c. These are specimens of the defiant titles of the most readable of the controversial writings. But this literary strife was drowned in the burst of loud outcries against Wallenstein, which pierced from Pomerania through all the German States, on account of the battle near Stralsund, and his shameful conduct towards the Pomeranian Duke and his country, and finally the horrible ill treatment of the men and women of Pasewalk. Again these lamentations changed into a shout of joy from all the Protestants. Again hope and confidence revived; this time it was a man, whom the nation, with the genuine German longing to love and honour, welcomed with shouts of jubilee. What had been wanting to the Germans for a century, came to them from the North, an idol and a hero. But he was a foreigner.