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It has been suggested that if Denmark had been more agressive at the Battle of Lutter am Barenberge, they could have defeated the Imperial forces. So what would the effect have been of a desicive Danish victory?
In OTL Christian of Denmark lost his elite forces there and was crippled for the rest of the war, and in fact the Danish army was more or less crippled until the 1670ties. Here he can continue fighting, but a single desicive defeat can cripple his army. Of course he can also continue into Bohemia and liberate it.