The First World War reshaped the political map of Europe and introduced warfare on a scale previously unimaginable, with innovations in technology and tactics that would define the twentieth century. From the trenches of the Western Front to the diplomatic negotiations that followed, this global conflict touched nearly every continent and left deep marks on culture, society, and international relations. Test your knowledge of the key events, figures, and consequences that made the Great War a turning point in modern history.
▶ Play today's quizWhich 1914 event is widely seen as the spark that started World War I?
Source: One pistol shot by 19-year-old Gavrilo Princip toppled a chain of alliances and dragged the whole continent to war.
What was the deadly open ground between two opposing front-line trenches called?
Source: Crossing this cratered strip of barbed wire and mud was so lethal that the phrase still means any dangerous middle ground.
Soldiers optimistically expected the whole war to be over by what point?
Source: Troops marched off in 1914 sure they'd be home for Christmas; instead the fighting dragged on for over four years.
Which terrifying weapon was first unleashed on a mass scale at Ypres in 1915?
Source: Clouds of chlorine drifted over the trenches, and soldiers learned to urinate on cloth to make a crude first gas mask.
Which country exited the war in 1917 following a revolution at home?
Source: The Bolsheviks pulled Russia out and signed a separate peace, freeing German troops to flood back to the Western Front.
In which city was Archduke Franz Ferdinand shot in 1914?
Source: His driver took a wrong turn in Sarajevo and stopped right in front of the assassin, sealing the Archduke's fate.
Whose invasion by Germany finally brought Britain into the war in 1914?
Source: Britain had pledged to protect neutral Belgium in an 1839 treaty Germany dismissed as a mere 'scrap of paper'.
In which year did the United States enter World War I?
Source: America stayed out for nearly three years before fresh U-boat attacks finally pushed it to declare war in 1917.
Which 1916 battle suffered nearly 60,000 British casualties on its first day alone?
Source: July 1, 1916 remains the bloodiest single day in British military history, a slaughter for almost no ground gained.
To which wartime alliance did Germany and Austria-Hungary belong?
Source: They were called 'Central' simply because of their geography, sitting in the middle of Europe between the Allied fronts.
Which 1919 treaty formally ended the war between Germany and the Allies?
Source: Its crushing reparations left Germany bitter, and many historians trace the seeds of the next world war straight to it.
Which German pilot, nicknamed the 'Red Baron', became the war's top flying ace?
Source: He scored 80 confirmed kills in his bright red triplane before being shot down himself in 1918.
What was the longest single battle of the war, fought at a French fortress city in 1916?
Source: It raged for ten months, and the French rallying cry there, 'They shall not pass', became legendary.
Which ocean liner's 1915 torpedoing by a U-boat helped turn American opinion against Germany?
Source: Nearly 1,200 died, including 128 Americans, and the outrage simmered for two years before the US joined the fight.
What new term did wartime doctors coin for soldiers' combat-induced psychological trauma?
Source: First blamed on exploding shells rattling the brain, it was an early recognition of what we now call PTSD.
What was the common nickname for ordinary British soldiers in the war?
Source: It came from 'Tommy Atkins', the generic name long printed on British army sample forms, while the Americans were Doughboys.
Which empire was dissolved by the postwar treaties, ending a reign of roughly 600 years?
Source: Its collapse redrew the entire Middle East and gave rise to the modern Republic of Turkey.
The disastrous 1915 Gallipoli campaign is solemnly commemorated every year in which two countries?
Source: The bloodbath forged the ANZAC legend, and April 25 is still a national day of remembrance Down Under.
The intercepted Zimmermann Telegram revealed a German plot to forge an alliance with which country?
Source: Germany dangled the return of Texas and Arizona to lure Mexico in, and the leaked cable helped drag America into the war.
Roughly how many military personnel are estimated to have died in World War I?
Source: Around 9 million soldiers died, but counting civilians and the flu that followed pushes the total death toll near 17 million.