events
February 18, 1915
U-boat Campaign: The Imperial German Navy institutes unrestricted submarine warfare in the waters around Great Britain and Ireland.
U-boat campaign
The U-boat campaign from 1914 to 1918 was the World War I naval campaign fought by German U-boats against the trade routes of the Allies, largely in the seas around the British Isles and in the Mediterranean, as part of a mutual blockade between the German Empire and the United Kingdom.
February 18
February 18 is the 49th day of the year in the Gregorian calendar; 316 days remain until the end of the year.