Battle of Galicia
Initially, the Polish Legions were composed of two legions: the Eastern and the Western Legion, both formed on August 27. After a Russian victory in the Battle of Galicia (August–September 1914) the Eastern Polish legion refused to fight on behalf of the Austro-Hungarian side against Russia and was disbanded on September 21. On December 19, the Western legion was transformed into three brigades: the I Brigade of the Polish Legions under Józef Piłsudski, formed in mid-December; the II Brigade of the Polish Legions under Józef Haller de Hallenburg, formed between mid-December and March (sources vary); and the III Brigade of the Polish Legions under Zygmunt Zieliński (later Bolesław Roja), formed on May 8, 1915. All brigades had the following: