German Declaration of Naval Blockade Against Shipping to Britain (February 4, 1915)
The following is the declaration by the German government informing countries around the world that Germany was establishing a war zone
Germany did this in response to Britain’s naval blockade of Germany.
“The waters round Great Britain and Ireland, including the English Channel, are hereby proclaimed a war region.
On and after February 18th every enemy merchant vessel found in this region will be destroyed, without its always being possible to warn the crews or passengers of the dangers threatening.”