World War I: Combined Austro-Hungarian and German Central Powers, reinforced by the recently joined Bulgaria launched a new offensive against Serbia under command of August von Mackensen.

World War I, or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. Major theatres of war included Europe and the Middle East, and well as parts of Africa and the Asia-Pacific. One of the deadliest conflicts in history,…