The countries that were allied during World War 1 are Austria-Hungary and Germany.
During the World War 1 which lasted five years, from 1914 till 1918, the countries of France, Britain, Russia, Japan, and Italy faced off against Germany, Austria-Hungary, the Ottoman Empire and Bulgaria which saw the Triple Entente and the Triple Alliance.
Therefore, the countries that were allies during that war were Austria-Hungary and Germany.
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