First Battle of the Marne: September 6-12, 1914 The Germans pursued the Russians, essentially annihilating the armies with 30,000 casualties and more than 90,000 taken prisoner. But after intercepting unencrypted radio messages from the Russians, the Germans are able to reorganize their strategy, forcing the Russians into retreat.

The battle begins with Russian armies attacking German troops in German East Prussia (now Poland) from the south and the east, which, at first, works. Battle of Tannenberg: August 26-August 30, 1914ĭubbed the Battle of Tannenberg by the victorious Germans in revenge for the 1410 conflict in which the Poles crushed the Teutonic Knights, this would be the country’s biggest win against Russia along the Eastern Front. Some 1,600 British and 5,000 Germans casualties are reported. In the final of four “Battles of the Frontier” held in the first weeks of World War I, the British forces are overpowered and forced to retreat, handing the Germans a strategic victory. The first European clash since 1815’s Battle of Waterloo, the Battle of Mons takes place in Mons, Belgium, with a British Expeditionary Force that numbers about 75,000 fighting an estimated 150,000 Germans in an attempt to hold the Mons-Conde Canal.

First tanks in battle