Early 1918 saw both Germany and Russia each eager to make peace for their own reasons, but the power of the German military forced the Bolshevik government in Russia to accept the Treaty of Brest-Litovsk.

The October Revolution was seen at the time as merely replacing one temporary arrangement with another. But the Bolsheviks had other ideas.

Although Iran was not a belligerent in the Great War, Russian and Turkish armies clashed in Iran and the nation suffered. The Greek government split over the war question.

As British troops advance into Palestine, the British Cabinet formally embraces the concept of a Jewish homeland in Palestine, but does not explain what that means.

Is it because of the Great War that Billy Sunday had his greatest revival ever? Or that peasant children in Portugal witness miracles?

The Chinese government (despite its many internal problems) was willing to enter the Great War in order to reclaim concessions lost to Germany and Austria. The Allies were initially hesitant, but as the casualties mounted and the shortage of manpower became acute, Chinese civilian laborers began working behind the front lines. Later, after a U-boat attack killed hundreds of Chinese, China formally entered the war.

Mata Hari earned internationally acclaim as a dancer during the Belle Époque by trading on her exotic (and mostly invented) origins. But during the Great War, being mysterious and not entirely honest can get you killed.

In the autumn of 1917, the Germans lend the Austrians a hand in their losing struggle with Italy. The result is the Battle of Caporetto, which undoes all of Italy's previous gains and brings the Central Powers within 20 miles of Venice.

After the failure of the Nivelle Offensive, and with Russia collapsing into chaos, the British Cabinet unleashes Haig, who begins his latest offensive.

By autumn of 1917, the Russian Provisional Government had failed. It lost popular support, the Army was collapsing, and the Germans were advancing on Petrograd. Lenin determined it was time for the Bolsheviks to make their move.