Possible Clues:

• When e.e. cummings was interned
• Conflict that ended at 11:00 on 11/11
• 'All Quiet on the Western Front' conflict, briefly
• Conflict for which 'Over There' was written: Abbr
• The ''Over There'' era
• It started in 1914: abbr.
• 1910s conflict
• Red Baron's conflict, briefly
• Doughboys' conflict, for short
• Event from 1914 to 1918, briefly