Mo. Rev. Stat. § 270.040

The persons so notified, or any two of them attending, shall take an oath that they will fairly and impartially assess the damages or compensation in controversy, and they shall make out, sign and deliver to each party a written statement of their assessment of damages or compensation, and upon the payment of the same and the expenses of said controversy, the owner of such stock shall be entitled to take the same away, and if refused, he may maintain an action therefor, as in case of wrongful taking or detention of property.