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His murder catapulted into a war across Europe .
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German troops crossed the border into Belgium. In the first battle of World War I, the Germans assaulted the heavily fortified city of Liege, using the most powerful weapons in their arsenal .
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French and British forces confronted the invading German army, which had by then penetrated deep into northeastern France, within 30 miles of Paris.
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Germany declared a war zone around Britain, within which merchant ships were sunk without warning.
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Allied troops landed on the Gallipoli peninsula in Ottoman Turkey. The Gallipoli campaign was the land-based element of a strategy intended to allow Allied ships to pass through the Dardanelles, capture Constantinople (now Istanbul) and ultimately knock Ottoman Turkey out of the war.
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Sonnino began serious negotiations with London and France . The Treaty of London was signed on 26 April 1915 and Italy declared war against Austria-Hungary
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when the German army began pounding the forts and trenches with artillery fire. 1,200 guns smashed the French positions.
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(May 31–June 1, 1916), the only major encounter between the main British and German battle fleets in World War I, fought near the Skagerrak, an arm of the North Sea, about 60 miles (97 km) off the west coast of Jutland (Denmark).
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after a week-long artillery bombardment of the German lines. Advancing British troops found that the German defences had not been destroyed as expected and many units suffered very high casualties with little progress. The Somme became an attritional or 'wearing-out' battle.
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Like the Marne, it represents the checkmate of a supreme effort on the part of the Germans to end the war swiftly by a thunderstroke.
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following the loss of American lives in the torpedoed liners Lusitania and Arabic. After failing to seize control of the sea from the British at the Battle of Jutland in 1916, Germany resumed unrestricted submarine warfare
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President Woodrow Wilson asked a special joint session of the United States Congress for a declaration of war against the German Empire. Congress responded with the declaration
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in the city of Brest-Litovsk, located in modern-day Belarus near the Polish border, Russia signed a treaty with the Central Powers (Germany, Austria-Hungary, Ottoman Empire, Bulgaria) ending its participation in World War I
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General Pershing's troops launched an attack along the Meuse River and into northern France's rugged Argonne Forest that would prove to be the deadliest battle in American history.
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The truce, or Armistice, would start on the 11th hour, of the 11th day, of the 11th month, November 1918. The Armistice was signed at 5:00 a.m. by Marshal of France Ferdinand Foch, along with other Allies and Germany, inside of Foch's private railway car at Compagnie, France.