Editing Christian IV of Denmark (section)

===Kalmar War===
{{Main|Kalmar War}}
In 1611, he first put his newly organised army to use. Despite the reluctance of ''Rigsrådet'', Christian initiated a war with Sweden for the supremacy of the [[Baltic Sea]].<ref name="gad" /> It was later known as the [[Kalmar War]] because its chief operation was the Danish capture of [[Kalmar]], the southernmost fortress of Sweden. Christian compelled King [[Gustavus Adolphus of Sweden]] to give way on all essential points at the resulting [[Treaty of Knäred]] of 20 January 1613.<ref name="Britannica" /> However, despite Denmark's greater strength, the gains of the war were not decisive.<ref name="gad" />

He now turned his attention to the [[Thirty Years' War]] in Germany. Here, his objectives were twofold: first, to obtain control of the great German rivers—the [[Elbe]] and the [[Weser]]—as a means of securing his dominion of the northern seas; and secondly, to acquire the secularised German [[Archdiocese of Bremen]] and [[Prince-Bishopric of Verden]] as [[appanage]]s for his younger sons. He skillfully took advantage of the alarm of the German [[Protestant]]s after the [[Battle of White Mountain]] in 1620, to secure co-adjutorship of the See of Bremen for his son [[Frederick III of Denmark|Frederick]] (September 1621). A similar arrangement was reached in November at [[Verden (Aller)|Verden]]. Hamburg was also induced to acknowledge the Danish overlordship of [[Holstein]] by the [[compact of Steinburg]] in July 1621.<ref name="Britannica" />