The Sea awaits us. We need your supplies from the North. Strip everything: every railroad pike, every waterbucket. We need metal. A shipment is due from BB but long overdue. Come through for me, Blacknails. Send your supplies directly to the "barn" this time. No time to squander.
The person known as "Blacknails" is only mentioned in this note, and nowhere else in the game or Warcraft Universe.