History of the North Sea United Kingdom and Germany signed the Treaty of Heligoland. The Cod War of 1893 erupted between Denmark and Britain over fishing territories. Denmark declared a fishing territory of 13 nautical miles (24 km) around their shores which included Iceland and the Faroe Islands. Britain did not acknowledge this claim. Tensions in the North Sea were again heightened in 1904 by the Dogger Bank incident, in which Russian naval vessels mistook British fishing boats for Japanese ships and fired on them, and then upon each other. The incident, combined with Britain's alliance with Japan and the Russo-Japanese War led to an
Cod fisheries that can be taken not only with nets but with fishing-baskets," and around 1600 English fishing captains still reported cod shoals "so thick by the shore that we hardly have been able to row a boat through them." In the early sixteenth century, fishermen from England, France, Spain and Portugal discovered the best places to fish for cod in the waters off Newfoundland, and how best to preserve the fish for the journey home. The French, Spanish and Portuguese fishermen tended to fish on the Grand Banks and other banks out to sea, where fish were always available. They salted