The war on the seas in the First World War takes place in the Atlantic, where the Kaiserliche Marine and Royal Navy face off for the duration of the battle. The British navy, November 3rd 1914, declares the North Sea “war zone” and decreed the naval blockade against the Germans. The warships of the latter were mostly safe in port, defended by minefields, while the freighter carrying raw materials and supplies underwent stringent controls.The strategy of the naval blockade had a great effects on the war outcomes, wearing out the Central Powers. In the last year of the conflicts the Kaiser Wilhelm II of Germany (1859 – 1941) had to face great difficulties in finding food for his population. Some stories tells that even the bread, given the scarcity of flour, were “reached” with sawdust.