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The assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo triggered a chain of events leading to the outbreak of war. -
Austria-Hungary declares war on Serbia, sparking a series of alliances and escalations that lead to the beginning of WW1. -
This battle marked the failure of the Schlieffen Plan by the germans to quickly defeat France. It resulted in trench warfare on the Western Front. -
One of the longest and most costly battles of the war, Verdun symbolized the determination of both sides, with staggering casualties. -
Another major battle on the Western Front, the Battle of the Somme resulted in significant casualties for both sides and highlighted the brutality of trench warfare. -
The sinking of the Lusitania and the interception of the Zimmerman Telegram prompted the United States to enter the war on the side of the allies. -
The Russian Revolution overthrew the Tsarist regime, leading to the rise of the Bolsheviks and Russia's subsequent exit from the war. -
The treaty between Russia and the Central Powers ended Russia's involvement in the war, ceding significant territory and resources to germany. -
The last major German offensive of the war, aimed at breaking the stalemate on the Western Front, ultimately failed and exhausted the German resources. -
Signed between the Allies and Germany, this armistice ended the fighting on the Western Front, effectively marking the end of WW1.