Which identifies a major russian victory on the eastern front during world war i? battle of tannenberg brusilov offensive gallipoli campaign battle of the somme

Correct  The Brusilov Offensive

Explanation:

I'll give more details about the Brusilov Offensive momentarily. First let's dispense with the other choices of World War I battles:

About the Brusilov Offensive:

Named for the Russian commander in charge, General Aleksei Brusilov, the Brusilov Offensive was a major Russian attack against the Central Powers on the Eastern Front.  The offensive began on June 4, 1916 and lasted into September.  It was a great victory for the Russians, but came at a tremendous cost of at least 500,000 casualties.  The Central Powers (Germany, Austria-Hungary, and the Ottoman Empire) suffered even more losses, with around a million casualties.

Yep thats the right answer!

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