Possible Clues:

• Render motionless from lack of wind
• Make quiet or still - sounds like an order
• Make it so that it won't come to blows
• Don't get the wind up!
• Don't get the wind up, perhaps
• Don't get the wind up and keep your cool
• 'Stop panicking!'
• Make still (from lack of wind)
• Leave a sailing vessel unable to move for lack of wind
• Sedate city with royal house not spoken about