The Russian advance during the start of the Battle of Kostiuchnówka was also known as what?
Brusilov Offensive: The Brusilov Offensive (Russian: Брусиловский прорыв "Brusilovskiĭ proryv", literally: "Brusilov's breakthrough"), also known as the "June Advance", of June to September 1916 was the Russian Empire's greatest feat of arms during World War I, and among the most lethal offensives in world history.
i don't know