State of the Empire.--Of Europe.--Mansfeld.--Christian, Duke of
Brunswick.--Wallenstein raises an Imperial Army at his own expense.
--The King of Denmark defeated.--Death of Mansfeld.--Edict of
Restitution in 1628.--Diet at Ratisbon.--Negociations.--Wallenstein
deprived of the Command.--Gustavus Adolphus.--Swedish Army.--Gustavus
Adolphus takes his leave of the States at Stockholm.--Invasion by the
Swedes.--Their progress in Germany.--Count Tilly takes the Command of
the Imperial Troops.--Treaty with France.--Congress at Leipzig.--Siege
and cruel fate of Magdeburg.--Firmness of the Landgrave of Cassel.--
Junction of the Saxons with the Swedes.--Battle of Leipzig.--
Consequences of that Victory.