Who was in the Allied powers.

The Eastern Front was predomintly faught between the Russians Vs. the British

Due to the Trenches being used by both sides, the war line was easy to move back & forth.

The Russians had already finished going through Industrialization so joining & staying invloved in WWI was easy.

The whole purpose of the Gallipoli campaign through the Ottoman empire was so that British could resupply the Russians.

The 2nd October/November Russian revolution was so that Russia would stop fighting agaisnt the British & instead join them.

The Treaty of Brest-Litovsk took Russia out of WWI, so that the Germans could focus on only 1 front.