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June 28- The Assassination of Archduke Franz Ferdinand

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June 28- The Assassination of Archduke Franz Ferdinand

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Archduke Franz Ferdinand, prince to the Austria-Hungary throne, is assassinated in Sarajevo by a Serbian named Gavrilo Princip. The archduke traveled to Sarajevo to inspect the armed forces in Bosnia and Herzegovina, which was annexed by Austria-Hungary. The Serbian nationalists believed that the territory belonged to Serbia and killed the prince.

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Austria-Hungary makes demands on Serbia for retribution. However, Serbia does not meet one of the demands. Serbia, surprisingly, accepted most terms except one: allowing Austrian- Hungarian officials to investigate on their territory. Serbia states that it would be a violation of the Constitution and of the law of criminal procedure.

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July 28- Austria Hungary declares war on Serbia

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July 28- Austria Hungary declares war on Serbia

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The Austria-Hungary is threatened by the Serbians when they show ambition to take over the Balkans. The Austria-Hungary determines that military invasion is the appropriate response to the assassination of the archduke. In addition, Russia begins mobilizing its troops.

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August 1- Germany declares war on Russia

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August 1- Germany declares war on Russia

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In support of their alliance with Austria, Germany declares war on Russia. Furthermore, Germany sees the Russian mobilization as a war threat.

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August 3- Germany declares war on France as part of the Schlieffen Plan

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August 3- Germany declares war on France as part of the Schlieffen Plan

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As France is allied with Russia, Germany also declares war on France. The Schlieffen Plan was designed to attack France when the Russian mobilization had started to move closer to the German border.

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August 4- Germany invades Belgium & Britain declares war on Germany

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August 4- Germany invades Belgium & Britain declares war on Germany

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Germany invades Belgium. However, in order to proceed with the invasion, it required Britain to overlook the Treaty of London and let the Germans pass through. Britain declares war on Germany a few hours later and refuses to let the military to pass by, since Germany had attacked France, and the British were allied with the French.

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September 5 to 12- The First Battle of the Marne

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September 5 to 12- The First Battle of the Marne

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The advancing German army is stopped before Paris by the British and French at the First Battle of the Marne. The Germans dig in and four years of trench warfare begins.

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October 19 to November 22- The Allies defeat the Germans at the First Battle of Ypres

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October 19 to November 22- The Allies defeat the Germans at the First Battle of Ypres

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Near the city of Ypres, The Allied forces, Russia, Britain, France and the German forces goes to war to control the city and its advantageous position in the north of Belgium.

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November 11 - The Ottoman Empire declares war on the Allies. 

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November 11 - The Ottoman Empire declares war on the Allies. 

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In Constantinople, the religious leader Sheikh-ul-Islam declares an Islamic holy war on behalf of the Ottoman government, urging his Muslim followers to take up arms against Britain, France, Russia, Serbia and Montenegro in World War I.

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December 24 - An unofficial truce is declared between the two sides at Christmas. 

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December 24 - An unofficial truce is declared between the two sides at Christmas. 

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Pope Benedict XV suggested a temporary hiatus of the war for the celebration of Christmas. The warring countries refused to create any official cease-fire, but on Christmas the soldiers declared their own unofficial truce.

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The Germans begin to use submarines against Allied merchant ships around the island of Britain.

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The Allies attack the Ottoman Empire at the Battle of Gallipoli. This campaign will last over eight months and will end as a victory for the Ottomans and the retreat of the Allies.

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The Lusitania, a luxury British passenger ship, is sunk by a German submarine. 1,195 civilians were killed. This act sparks international outrage and contributes to the United States joining the war against Germany.

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Bulgaria enters the war when Prime Minister Vasil Radoslavov of Bulgaria issues a statement of declaring war on Serbia.

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February 21 - The Battle of Verdun begins between France and Germany. 

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February 21 - The Battle of Verdun begins between France and Germany. 

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This battle will last until December of 1916 and will finally result in a French victory.

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The largest naval battle of the war, the Battle of Jutland, is fought between Britain and Germany in the North Sea.

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July 1 - The Beginning of the Somme Battle

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July 1 - The Beginning of the Somme Battle

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The Battle of the Somme begins on the morning of July first; divisions of the British 4th Army begins to advance on a 15-mile front north of the Somme.  Over 1 million soldiers will be wounded or killed.

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The British intercept the Zimmerman Telegram in which Germany tries to convince Mexico to join the war. This will result in the United States declaring war on Germany.

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The Russian Revolution begins. Tsar Nicholas II was removed from power on March 15. Supported by 90,000 men and women on strike, the protesters clashed with police but refused to leave the streets.

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The United States enters the war, declaring war on Germany, and entered the conflict in Europe. And ready to fight with everything they could.

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The Bolsheviks, led by Vladimir Lenin, overthrow the Russian government. The interim government was toppled, the Soviets seized power, and Russia later terminated the Triple Entente military alliance with France and Britain.

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December 17 - Russians decide to leave war

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December 17 - Russians decide to leave war

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The Russians agree to peace with the Central powers and leave the war for their own good.

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January 8 - Woodrow Wilson’s Fourteen Points

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January 8 - Woodrow Wilson’s Fourteen Points

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president Woodrow Wilson issues his "Fourteen Points". These points were made to clarify why peace is better than war.

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Germany launches the Spring Offensive hoping to defeat the Allies before reinforcements from the United States can be deployed. This action was taken as a desperate last push to try to defeat the allies and capture Paris to regain supplies and strategic locations to hold off the american reinforcements.

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The Second Battle of the Marne begins. This battle will end on August 6 as a decisive victory for the Allies. This was the last attempt by Germany to try to push back the allies and gain ground in France.

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Germany agrees to an armistice and the fighting comes to an end at 11am on the 11th day of the 11th month.

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1919 June 28 - signing of the treaty of Versailles 

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1919 June 28 - signing of the treaty of Versailles 

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The Treaty of Versailles is signed by Germany and World War I comes to an end. Germany is humiliated with the treaty and will lead to future problems for the country.