Learn World War I one clear lesson at a time. Take the 50-question Field Exam, climb the ranks from Recruit to General, and follow every major event from Sarajevo to the Armistice.
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World War I appears in almost every history classroom, yet it is easy to get lost in the names, dates and battles. WW1 Schools was built to fix that. Here you can learn the Great War the way a good teacher would teach it: one clear lesson at a time, checked with quizzes, and anchored to a timeline so every event has its place. Whether you are a student preparing for a test, a teacher looking for a classroom activity, or simply curious about the war that shaped the modern world, this is your starting point.
World War I was a global conflict fought from July 1914 to November 1918. It began as a regional crisis in the Balkans and, within weeks, pulled in the great powers of Europe. By the end, more than 30 nations had declared war, and fighting had spread across Europe, the Middle East, Africa, Asia and the world's oceans.
Two sides faced each other. The Allied Powers, led at first by France, Britain and Russia and later joined by Italy, Japan, the United States and others, fought against the Central Powers: Germany, Austria-Hungary, the Ottoman Empire and Bulgaria.
The human cost was staggering. More than 65 million soldiers were mobilized, and around 9 million of them died. Millions of civilians also lost their lives through fighting, hunger and disease. People at the time called it the Great War, and many hoped it would be the war to end all wars.
Historians still debate exactly why the war broke out, but most lessons begin with four long-term causes that are easy to remember with the acronym MAIN.
The spark came on June 28, 1914, when Gavrilo Princip, a young Bosnian Serb, shot Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, in Sarajevo. Austria-Hungary blamed Serbia and declared war one month later. Russia moved to support Serbia, Germany backed Austria-Hungary and declared war on Russia and France, and when German troops marched through neutral Belgium, Britain joined the fight. In little more than a week, one assassination had become a continental war.
History makes more sense in order. Tap a year to see the key events, then test yourself again in the Field Exam above.
On the Western Front, the early war of movement ended in late 1914. Both sides dug in, and a line of trenches soon stretched roughly 700 kilometers (about 440 miles) from the Belgian coast to the Swiss border.
Trench life was a mix of boredom and terror. Soldiers rotated between front-line trenches, support trenches and rest areas behind the lines. They lived with mud, rats, lice, cold and constant shellfire. Standing for days in waterlogged trenches caused trench foot, a painful condition that could lead to amputation if left untreated.
Between the enemy lines lay no man's land, a stretch of ground torn by shell craters and tangled with barbed wire. Attacking across it meant facing machine guns and artillery. That is why battles such as the Somme and Verdun cost hundreds of thousands of lives for very small gains of ground.
World War I was the first great industrial war. Factories turned out weapons on a scale never seen before, and many of them changed how wars would be fought forever.
1917 was the turning point. Russia, worn down by defeats and shortages, collapsed into revolution, and its new Bolshevik government made peace with Germany at Brest-Litovsk in March 1918. At almost the same moment, the United States joined the Allies, bringing fresh troops and huge resources.
Germany gambled on a massive Spring Offensive in 1918 to win before American soldiers arrived in large numbers. The attacks gained ground but could not break the Allied lines. From August, the Allies struck back in the Hundred Days Offensive and pushed German forces into retreat. With its partners surrendering and unrest spreading at home, Germany asked for terms. The Kaiser abdicated, and the Armistice took effect at 11 a.m. on November 11, 1918: the eleventh hour of the eleventh day of the eleventh month.
The war redrew the map of the world. Four empires, the German, Austro-Hungarian, Ottoman and Russian, fell apart, and new countries such as Poland, Czechoslovakia and Yugoslavia appeared. The Treaty of Versailles, signed in 1919, blamed Germany for the war and demanded reparations, decisions that historians often link to the tensions that led to World War II. The war also gave birth to the League of Nations, the first major attempt at a worldwide peace organization.
It changed everyday life, too. Women took on jobs in factories, transport and nursing, which strengthened the case for women's voting rights in several countries. Medicine advanced in areas such as blood transfusion and plastic surgery. And the red poppy, inspired by John McCrae's poem "In Flanders Fields," became a lasting symbol of remembrance.
No single country is usually blamed for everything. Austria-Hungary declared war on Serbia first, Germany's backing of Austria-Hungary and its invasion of Belgium widened the conflict, and the alliance system pulled in the rest. The Treaty of Versailles officially placed responsibility on Germany and its allies, but historians still debate the question.
About four years and three months, from July 28, 1914, to the Armistice on November 11, 1918. The formal peace treaties were signed in 1919 and 1920.
The United States declared war on Germany on April 6, 1917, after Germany resumed unrestricted submarine warfare and the Zimmermann Telegram was made public.
Before 1939, nobody knew a second world war would follow. "The Great War" described a conflict larger and more destructive than anything the world had seen before.
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