Wallenstein then marched north.

In the meantime Tilly had attacked King Christian at Lutter, and completely defeated him.

I will tell you about that battle some other time.

When Wallenstein came north it was decided that Tilly should carry the war into Holland, and that Wallenstein should deal with the King of Denmark and the Protestant princes.

In the course of two years he drove the Danes from Silesia, subdued Brandenburg and Mecklenburg, and, advancing into Pomerania, besieged Stralsund.
"What a siege that was to be sure! Wallenstein had sworn to capture the place, but he didn't reckon upon the Scots.