Viking Age by a Viking leader called Bagsecg and his five earls. Aided by the Great Heathen Army (which had already overrun much of England from its base in Jorvik), Bagsecg's forces, and Halfdan's forces (through an alliance), the combined Viking forces raided much of England until 871, when they planned an invasion of Wessex. On 8 January 871, Bagsecg was killed at the Battle of Ashdown along with his earls. As a result, many of the Vikings returned to northern England, where Jorvic had become the centre of the Viking kingdom, but Alfred of Wessex managed to keep them out of
Battle of Stellau Rügen in 1200, followed by an armed conflict in Dithmarschen. Duke Valdemar of Schleswig ordered his army to prepare for war and side with Denmark, ruled by his brother. Adolf led his German army from Holstein to battle in Stellau and crushed the Danes. However, when Adolf and his forces pulled back toward the city of Hamburg, he was besieged, defeated, and captured by Valdemar. In 1202, Valdemar of Schleswig became King Valdemar II of Denmark. His imprisonment of Adolf continued until 1203, when due to an illness, he was freed by the new king on the condition that he