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Allies
The Triple Entente, later known as the Allies, consisted of France, Britain, and Russia. The Triple Alliance consisted of Germany, Austria-Hungary, and Italy. -
Central Powers
Germany and Austria-Hungary, together with the Ottoman Empire—an empire of mostly Middle Eastern lands controlled by the Turks—were later known as the Central Powers. The alliances provided a measure of international security because nations were reluctant to disturb the balance of power. -
1914 Assassination of Archduke France Ferdinand
In June 1914, Archduke Franz Ferdinand, heir to the Austrian throne, visited the Bosnian capital Sarajevo. As the royal entourage drove through the city, Serbian nationalist Gavrilo Princip stepped from the crowd and shot the Archduke and his wife Sophie. Princip was a member of the Black Hand, an organization promoting Serbian nationalism. The assassinations touched off a diplomatic crisis. On July 28, Austria-Hungary declared what was expected to be a short war against Serbia. -
Schlieffen Plan
On August 3, 1914, Germany invaded Belgium, following a strategy known as the Schlieffen Plan. This plan called for a holding action against Russia, combined with a quick drive through Belgium to Paris; after France had fallen, the two German armies would defeat Russia. As German troops swept across Belgium, thousands of civilians fled in terror. In Brussels, the Belgian capital, an American war correspondent described the first major refugee crisis of the 20th century. -
Sinking of British liner Arabic
Three months later, in August 1915, a U-boat sank another British liner, the Arabic, drowning two Americans. Again the United States protested, and this time Germany agreed not to sink any more passenger ships. -
Sinking of British liner Lusitania
One of the worst disasters occurred on May 7, 1915, when a U boat sank the British liner Lusitania (lLQsG-tAPnC-E) off the southern coast of Ireland. Of the 1,198 persons lost, 128 were Americans. The Germans defended their action on the grounds that the liner carried ammunition. Despite Germany’s explanation, Americans became outraged with Germany because of the loss of life. American public opinion turned against Germany and the Central Powers. -
Sinking of French passenger liner Sussex
March 1916 Germany broke its promise and torpedoed an unarmed French passenger steamer, the Sussex. About 80 passengers, including Americans, were killed or injured. Once again the United States warned that it would break off diplomatic relations unless Germany changed its tactics. Again Germany agreed, but there was a condition: if the United States could not persuade Britain to lift its blockade against food and fertilizers, Germany would consider renewing unrestricted submarine warfare. -
Battle of the Somme
The scale of slaughter was horrific. During the First Battle of the Somme— which began on July 1, 1916, and lasted until mid-November—the British suffered 60,000 casualties the first day alone. Final casualties totaled about 1.2 million, yet only about seven miles of ground changed hands. -
Trench Warfare
This bloody trench warfare, in which armies fought for mere yards of ground, continued for over three years. Elsewhere, the fighting was just as devastating and inconclusive. -
Germany blockades the North Sea
Germany responded to the British blockade with a counterblockade by U-boats (from Unterseeboot, the German word for a submarine). Any British or Allied ship found in the waters around Britain would be sunk—and it would not always be possible to warn crews and passengers of an attack. -
Wilson's "Peace without victory speech"
In a speech before the Senate in January 1917, the president called for “a peace without victory. . . . a peace between equals,” in which neither side would impose harsh terms on the other. Wilson hoped that all nations would join in a “league for peace” that would work to extend democracy, maintain freedom of the seas, and reduce armaments. -
Zimmerman note
Zimmermann note, a telegram from the German foreign minister to the German ambassador in Mexico that was intercepted by British agents. The telegram proposed an alliance between Mexico and Germany and promised that if war with the United States broke out, Germany would support Mexico in recovering “lost territory in Texas, New Mexico, and Arizona.” -
Bolshevik Revolution
(RUSSIA) Revolutionaries ousted the czar in March 1917 and established a provisional government. In November, the Bolsheviks, led by Lenin and Trotsky, overthrew the provisional government. They set up a Communist state and sought peace with the Central Powers.