The Battle of Jastków was a World War I battle that took place July 31–August 3, 1915, near the village of Jastków, in the Lublin Governorate of Congress Poland, Russian Empire. It was a major clash between the Russian Army and the Austro-Hungarian Polish Legions (primarily the 1st Brigade, Polish Legions). It was one of the Legion's largest engagements, and its first major one. The battle ended with the Austro-Hungarian and Polish victory, as the Russian forces retreated.
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Text from the Wikipedia article “Battle of Jastków”, available under CC BY-SA 4.0.