Brusilov offensive
Battle
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The Brusilov offensive, 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. Wikipedia
Dates: Jun 4, 1916 – Sep 20, 1916
Territorial changes: Russian capture all Eastern Galicia and part of Northern Bukovina
Location: Galicia, Volhynia, and Kingdom of Galicia and Lodomeria