World War I: First Battle of the Marne begins. Northeast of Paris, the French attack and defeat German forces who are advancing on the capital.

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. One of the deadliest conflicts in history, World War I resulted in an estimated 15 to 22 million deaths, including those in war crimes and genocides.…