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Archduke Franz Ferdinand was the heir presumptive to the throne of Austria-Hungary. So, when he was assassinated by Gavrilo Princip a South Slav nationalist it caused a war between Austria and Serbia then Russia declared war on Austria and other alliances joined in. -
Russia got involved because Russia had an alliance with Serbia, but Germany then declared war on Russia because Germany had an alliance with Austria-Hungary. -
Britain declared war on Germany because it invaded neutral Belgium. After all, Britain had agreements to protect both Belgium and France. -
Germany attacked Liege in Belgium, breaking Belgium's neutrality. Germany wanted to invade France through Luxembourg and Belgium, despite their neutrality. -
German forces unleashed over 150 tons of deadly chlorine gas on two French colonial divisions in Ypres, Belgium. This was the first major gas attack by the Germans, and it had a big impact on the Allied line. -
The Lusitania, a British submarine, was sunk by a German submarine near Ireland on May 7, 1915. The crew didn't follow warnings, and the ship, carrying munitions, was sunk. Many lives were lost, including 128 Americans, causing outrage and protests. This event eventually led to the U.S. entering World War I. -
The Battle of Verdun was a long and bloody fight between the French and German armies in World War I. It lasted from February to December 1916 and had devastating casualties. -
The Somme the British losses amounted to some 420,000 men. The French, who had played an increasing part in the later stages, raised their war casualties by 194,000. Against this Allied total of more than 600,000, the Germans suffered more than 440,000 casualties. -
a prototype tank nicknamed Little Willie rolls off the assembly line in England. Little Willie was far from an overnight success. It weighed 14 tons, got stuck in trenches, and crawled over rough terrain at only two miles per hour. However, improvements were made to the original prototype and tanks eventually transformed military battlefields. -
On January 16, 1917, British code breakers intercepted an encrypted message from Zimmermann intended for Heinrich von Eckardt, the German ambassador to Mexico. -
German U-boat submarine raises its head again, as Germany returns to the policy of unrestricted submarine warfare it had previously suspended in response to pressure from the United States and other neutral countries. -
After the U.S. Senate voted 82 to 6 to declare war against Germany, the U.S. The House of Representatives endorsed the declaration by a vote of 373 to 50, and America formally entered World War I. -
The Treaty of Brest-Litovsk was a separate peace treaty signed on March 3, 1918, between Soviet Russia and the Central Powers. -
the Great War ended Germany, bereft of manpower and supplies and faced with imminent invasion, signed an armistice agreement with the Allies in a railroad car outside Compiegne, France. The First World War left nine million soldiers dead and 21 million wounded, with Germany, Russia, Austria-Hungary, France, and Great Britain each losing nearly a million or more lives. -
The Treaty of Versailles was a peace agreement that marked the end of World War One. It was signed on 28 June 1919 by Germany and most of the Allied Powers at the Palace of Versailles