King James, who had seen unmoved the misfortunes which had befallen his daughter and her husband, and who had been dead to the general feeling of the country, could no longer resist, and England agreed to supply an annual subsidy; Holland consented to supply troops; and the King of Denmark joined the League, and was to take command of the army.
"In Germany the Protestants of lower Saxony and Brunswick, and the partisan leader Mansfeldt, were still in arms.

The army under the king of Denmark advanced into Brunswick, and was there confronted by that of the league under Tilly, while an Austrian army, raised by Wallenstein, also marched against it.

Mansfeldt endeavoured to prevent Wallenstein from joining Tilly, but was met and defeated by the former general.
Mansfeldt was, however, an enterprising leader, and falling back into Brandenburg, recruited his army, joined the force under the Duke of Saxe-Weimar, and started by forced marches to Silesia and Moravia, to join Bethlem Gabor in Hungary.

Wallenstein was therefore obliged to abandon his campaign against the Danes and to follow him.

Mansfeldt joined the Hungarian army, but so rapid were his marches that his force had dwindled away to a mere skeleton, and the assistance which it would be to the Hungarians was so small that Bethlem Gabor refused to cooperate with it against Austria.
"Mansfeldt disbanded his remaining soldiers, and two months afterwards died.