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

Yep thats the right answer!

Correct answer: 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:

The Battle of Tannenburg was a huge loss for Russia. The battle resulted in the near destruction of the Russian Second Army. The Scond Army's commander, General Alexander Samsonov, committed suicide, knowing that the tsar would hold him responsible for the devastating loss. The Gallipoli Campaign was an Ottoman victory in Turkish territory, over forces of Britain and France. The Battle of the Somme was fought in French territory between British and French forces against the Germans,

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.