but endangered their previous acquisitions. The union of the two
northern monarchs was most to be dreaded, because, so long as it lasted,
it effectually prevented the Emperor and his general from acquiring a
footing on the Baltic, or effecting a landing in Sweden. But if they
could succeed in dissolving this union, and especially securing the
friendship of the Danish king, they might hope to overpower the
insulated force of Sweden. The dread of the interference of foreign
powers, the insubordination of the Protestants in his own states, and
still more the storm which was gradually darkening along the whole of
Protestant Germany, inclined the Emperor to peace, which his general,
from opposite motives, was equally desirous to effect. Far from wishing
for a state of things which would reduce him from the meridian of
greatness and glory to the obscurity of private life, he only wished to
change the theatre of war, and by a partial peace to prolong the general
confusion. The friendship of Denmark, whose neighbour he had become as
Duke of Mecklenburgh, was most important for the success of his
ambitious views; and he resolved, even at the sacrifice of his
sovereign's interests, to secure its alliance.

By the treaty of Copenhagen, Christian IV. had expressly engaged not to
conclude a separate peace with the Emperor, without the consent of
Sweden. Notwithstanding, Wallenstein's proposition was readily received
by him. In a conference at Lubeck in 1629, from which Wallenstein, with
studied contempt, excluded the Swedish ambassadors who came to intercede
for Mecklenburgh, all the conquests taken by the imperialists were
restored to the Danes. The conditions imposed upon the king were, that
he should interfere no farther with the affairs of Germany than was
called for by his character of Duke of Holstein; that he should on no
pretext harass the Chapters of Lower Germany, and should leave the Dukes
of Mecklenburgh to their fate. By Christian himself had these princes