World War I (WWI) was a war that occurred between the years 1914 and 1918. It was waged between the Allies and the Central Powerand involved more than 70 million combatants. Over 16 million combatants and non-combatants died during the course of the war, making it one of the deadliest in history. The war ended on November 11th, 1918 with an armistice and victory for the Allies.