In response to pleas from the French, the Russian Army undertakes an invasion of East Prussia in the hope of taking some of the pressure off of France.
The failure of the French counteroffensive has the Allies in retreat across the front, and it now appears there is no stopping the Germans short of Paris.
The Great War started as a conflict between Austria and Serbia. Now, amid all the other conflicts emerging as the war goes continental, Austria makes its bid to punish Serbia for the assassination of the Archduke Ferdinand.