History of the North Sea the North Sea though they saw little action. The Austro-Prussian War (1866) resulted in Prussia's gaining full control of the Kiel Canal, allowing their Baltic ports access to the North Sea. France declared war on Prussia 19 July 1870 which initiated the Franco-Prussian War (1870–1871). The French Navy was, at the time far larger and superior to the North German Federal Navy, the Navy of the North German Confederation. Though the French did take a number of merchant ships bound to and from North Germany, shortages of manpower and coal, as well as conflicting orders, made the attempted blockade of
History of the North Sea Danelaw, carving out his own kingdom. Harthacanute of Denmark and England was the last Viking king to rule over a territory spanning the North Sea. After Harthacanute's death, the kingdom broke apart. With the rise of William the Conqueror the North Sea began to lose its significance as an invasion route. The new order oriented most of England and Scandinavia's trade south, toward the Mediterranean and the Orient. The Baltic Sea became increasingly important for northern Germany and Scandinavia as well as the powerful Hanseatic League began to rise. Though the Hanseatic League was centered in the Baltic, it also