Related Clues:

• Multi-billion dollar industry
• Ten years' or hundred years' event
• Battle of nations
• Sphere of Mars
• "This means ---!"
• Serious hostilities
• In song, it's good for absolutely nothing
• 'That mad game the world so loves to play,' to Jonathan Swift
• Civil --
• Sun Tzu's 'The Art of ___'
• It can cause a draft
• What boosters boost
• Gen. Sherman called it hell
• Mars' thing
• Kind of paint or powers