The Unknown Soldier of World War I was buried here in 1920, and three years later the Eternal Flame was kindled.
The Eternal Flame was lit just three years after the Unknown Soldier's burial.
mnli hypothesis: The Eternal Flame was lit just three years after the Unknown Soldier's burial. premise: The Unknown Soldier of World War I was buried here in 1920, and three years later the Eternal Flame was kindled.