Relief map of Great Britain and Ireland, the North Sea, English Channel, and Atlantic Ocean, with northwestern Europe: France, Belgium, Holland, and Scandinavia. The war-zone outlined on the map was declared on February 4, 1915. On May 7, the Lusitania entered the war zone southwest of Ireland.
Map Text:Atlantisch Ozean, Nord-See, Kanal - Atlantic Ocean, North Sea, English ChannelKriegs-Gebiets-Grenze - War-zone-boundaryCaption:Westl[ichen] Kriegschaupl[atz]: Nr. 97. Karte III: Die Gewässer um Großbritannien und Irland werden als Kriegsgebiet erklärt. Serie 47/4Western front: No. 97 Map III: The waters around Britain and Ireland will be declared a war zone. Series 47/4Reverse:Ausgabe des Kriegsfürsorgeamtes Wien IX.Zum Gloria-Viktoria AlbumSammel. u. Nachschlagewerk des VölkerkriegesWar Office Assistance Edition, Vienna IXFor Gloria Victoria albumCollection and reference book of international war
"The Liverpool liner, Falaba, engaged in the African trade, with 90 sailors and 100 passengers aboard, was overtaken by a German submarine in St. George's Channel on March 29th [1915]. The captain was given five minutes to put his crew and passengers into lifeboats. At the expiration of the time limit, she was sunk by a torpedo and 111 persons, including women and children, were drowned."
Great Britain declared the entire North Sea a military zone effective November 5, 1914 and imposed a blockade of Germany. On February 4, 1915, Germany responded by announcing a submarine warfare campaign in which all ships of Britain and its allies were subject to sinking without notice. German Chancellor Bethmann Hollweg opposed the campaign, believing it would bring America into the war. The United States, Italy, and other neutral nations objected, but the campaign began February 18. Between Ireland and England, St. George's Channel is south of, and leads to, the Irish Sea. At its narrowest, between Rosslare Harbour, Ireland and Fishguard, Wales, the Channel is little more than 65 miles wide.
King's Complete History of the World War by W.C. King, page 141, copyright © 1922, by W.C. King, publisher: The History Associates, publication date: 1922
Unrestricted Submarine Warfare, Submarine Warfare, unrestricted submarine warfare, submarine warfare, 1915, March, 1915-03-29, Falaba, St. George's Channel