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
Kiel Canal Schleswig War put Schleswig-Holstein under the government of Prussia (from 1871 the German Empire), a new canal was sought by merchants and by the German navy, which wanted to link its bases in the Baltic and the North Sea without the need to sail around Denmark. In June 1887, construction started at Holtenau (), near Kiel. The canal took over 9,000 workers eight years to build. On 20 June 1895 the canal was officially opened by Kaiser Wilhelm II for transiting from Brunsbüttel to Holtenau. The next day, a ceremony was held in Holtenau, where Wilhelm II named it the