I want to know the answer to the following question:
What are the years after the war commonly known as?
All the background I'm provided with is that "During the First World War, Paris sometimes found itself on the front line; 600 to 1,000 Paris taxis played a small but highly important symbolic role in transporting 6,000 soldiers to the front line at the First Battle of the Marne.". Is that enough to answer the question?