When did France join World War I?
French entry into World War I
The war arose from conflict between two alliances: the Triple Alliance of Germany, Austria and Italy, and the Triple Entente of France, Russia and Britain. France had had a military alliance with Russia since 1894, designed primarily to neutralize the German threat to both countries. Germany had a military alliance with Austria-Hungary. In June 1914, Archduke Franz Ferdinand, the heir to the Austrian throne, was assassinated. The government of Austria decided to destroy Serbia once and for all, for stirring up trouble among ethnic Slavs. Berlin (Germany) secretly gave Austria a blank check, promising to support it militarily no matter what it decided. Both countries wanted a localized war, Austria versus Serbia. They mistakenly assumed that would no other powers would intervene, and failed to negotiate with Russia, France, and England to make sure the war remained localized. Unexpectedly, Russia decided to intervene to protect Serbia, a small fellow Slavic nation, despite there being no treaty requiring Russia to do so. The Tsar had the support of the President of France, who otherwise was hardly involved. Russia mobilized its army against Austria. Germany declared war on Russia and France, and invaded France through Belgium. Britain had an understanding and military and naval planning agreements with France, but no formal treaty obligations. Britain did have a treaty obligation toward Belgium, and as a result Britain joined France and Russia (the Allies) and declared war on Germany and Austria (the Central Powers). Japan, allied with Britain, joined the Allies. The Ottoman Empire (Turkey) joined the Central Powers. Italy, instead of joining Germany and Austria-Hungary with whom it had treaties, entered the war on the side of the Allies in 1915. The United States tried unsuccessfully to broker peace negotiations, and entered the war on the Allied side in April 1917. After very heavy losses on both sides, the Allies were decisively victorious, and divided the spoils of victory, such as the German and Ottoman colonies. France was a winner, while the German, Russian and Ottoman Empires disintegrated.[4]