Edited sentence: After this battle, the final one in the Kejserkriegen, Christian IV was ready for negotiations - and so was Wallenstein who understood the serious threat constituted by the Scandinavian alliance.An attempt to secure another bridgehead on the southern Baltic shore in August failed with Christian IV's defeat in the Battle of Wolgast.Christian responded with an amphibious campaign in 1628, using his fleet to make landfalls along the occupied coastlines and destroying the naval facilities in Ålborg, Wismar and Greifswald.He concluded an alliance with Gustavus Adolphus of Sweden in April, and both supported Stralsund in her successful resistance against Wallenstein.Initial success was with the Danish armies, commanded by Christian IV of Denmark and Ernst von Mansfeld.Mansfeld's army turned toward Silesia and Hungary, but the campaign failed in 1627, and Mansfeld deserted and later died of plague.The opponents, a Catholic League army commanded by Johann Tserclaes, Count of Tilly and an army of Ferdinand II, Holy Roman Emperor, commanded by Albrecht von Wallenstein, turned the tide in the battles of Dessau Bridge and Lutter am Barenberge in 1626.The treaty of Lübeck ended a stage of the Thirty Years' War that began in 1625 and is referred to as Lower Saxon or Emperor's War,.Wallenstein and Tilly subsequently gained Central and Northern Germany, joined their forces in summer, invaded Danish Holstein in September 1627 and advanced through Jutland.While Christian IV's control of the western Baltic Sea and the Danish isles was unchallenged, Wallenstein was given the Duchy of Mecklenburg vis-a-vis Denmark in January 1628, and was about to construct a navy of his own at the occupied ports of Ålborg, Wismar, Rostock and Greifswald starting in late 1627