January, 1915
War becomes "Total War" with German Zeppelin air raid on England
February 4
Germany declares a submarine blockade of Great Britain. Any ship approaching England is considered a legitimate target.
Photo: German U boat on the hunt for Allied shipping
German U boat on the hunt for Allied shipping
April 25
Allies begin nine-month battle for the Turkish peninsula of Gallipoli.
Photo: Australian headquarters staff wading ashore at Gallipoli, 1915
Australian headquarters staff wading ashore at Gallipoli, 1915
May 7
U-boat sinks the Lusitania. 1,198 civilians, including 128 Americans die.
Photo: Mass grave for Lusitania victims
Mass grave for Lusitania victims
August 30
Germany responds to U.S. anger by ceasing to sink ships without warning.
Photo: Allied ship attacked by German U-boat
Allied ship attacked by German U-boat
September 5
Tsar Nicholas takes command of the Russian armies.
September 15
British use gas in battle near Loos, but shifting winds cause 60,000 British casualties.
Photo: Poison gas attack, Flanders, Belgium
Poison gas attack, Flanders, Belgium
December 19
Sir Douglas Haig becomes commander of British Expeditionary Force.
December 28
Allies begin withdrawal of troops from Gallipoli.
January, 1915 War becomes "Total War" with German Zeppelin air raid on England February 4 Germany declares a submarine blockade of Great Britain. Any ship approaching England is considered a legitimate target.Photo: German U boat on the hunt for Allied shipping German U boat on the hunt for Allied shipping April 25 Allies begin nine-month battle for the Turkish peninsula of Gallipoli.Photo: Australian headquarters staff wading ashore at Gallipoli, 1915 Australian headquarters staff wading ashore at Gallipoli, 1915 May 7 U-boat sinks the Lusitania. 1,198 civilians, including 128 Americans die.Photo: Mass grave for Lusitania victims Mass grave for Lusitania victims August 30 Germany responds to U.S. anger by ceasing to sink ships without warning.Photo: Allied ship attacked by German U-boat Allied ship attacked by German U-boat September 5 Tsar Nicholas takes command of the Russian armies. September 15 British use gas in battle near Loos, but shifting winds cause 60,000 British casualties.Photo: Poison gas attack, Flanders, Belgium Poison gas attack, Flanders, Belgium December 19 Sir Douglas Haig becomes commander of British Expeditionary Force. December 28 Allies begin withdrawal of troops from Gallipoli.
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