Editing Otto II, Holy Roman Emperor (section)

===War with Denmark===
{{Main|German–Danish war of 974}}
In 950, Otto the Great had subdued the [[Kingdom of Denmark]] and forced the Danish King [[Gorm the Old]] to accept him as his overlord. Otto the Great also forced the king and his heir apparent [[Harald Bluetooth]] to [[convert to Christianity]]. Under the reign of Otto the Great, Denmark fulfilled all its obligations and regularly paid tribute to the Germans. When Harald became king in 958, he expanded the control of his kingdom into [[Norway]], becoming king there in 970. With his newly obtained power, the young ruler was no longer willing to accept German supremacy over his kingdom. In summer 974, Harald rebelled against Otto II.<ref name="Comyn, pg. 117"/> With the support of Norwegian troops, Harald was able to cross the Danish border into Germany, defeating the German forces stationed in the north. Otto II attacked Harald's forces, but the joint Danish-Norwegian army repelled the German army. In autumn, however, when the Norwegian allies sailed north to return to Norway, Otto II was able to counter Harald's advances at the [[Danevirke]].