Possible Clues:

• Removal of weapons
• Smart maiden worked out way to decrease international danger maybe?
• Mandate is rewritten to include Royal Marines laying down weapons
• Reduction in military forces and weapons
• Mad man tries to shoot -- weapon removal is the answer
• Corruptly mastermind a process for producing steel shares?
• A mastermind contrived to produce reduction in weapons
• A mastermind worked out possible subject of international agreement
• Reduction in military forces
• Removal of military weapons