Ukrainians entered World War I on the side of both the Central Powers, under Austria, and the Triple Entente, under Russia. Three-and-a-half million Ukrainians fought with the Imperial Russian Army, while 250,000 fought for the Austro-Hungarian Army. Austro-Hungarian authorities established the Ukrainian Legion to fight against the Russian Empire. This became the Ukrainian Galician Army that fought against the Bolsheviks and Poles in the post-World War I period (1919–23). Those suspected of Russophile sentiments in Austria were treated harshly.