The Battle of Jastków was a World War I battle that took place July 31–August 3, 1915, near the village of Jastków, then part of the 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.
References
Jan Konefał. Bitwa Legionów Polskich pod Jastkowem w dniach 31 lipca – 3 sierpnia 1915 r.. „Rocznik Lubelski”. T. 27/28 (1985–1986), p. 121-129, 1988. Lublin: Wydawnictwo Lubelskie. ISSN 0080-3510
Jan Konefał (2003). Jastków 1915: historia i pamięć. Towarzystwo Naukowe Katolickiego Uniwersytetu Lubelskiego. ISBN978-83-7306-117-0.