Wyoming Misc 13. Motion to Dismiss Action is a form used in the state of Wyoming when a party in a court case is seeking to have the action dismissed. It is typically used to challenge the legal sufficiency of the complaint or petition filed by the other party. There are two types of Wyoming Misc 13. Motion to Dismiss Action: Demurrer and Motion to Dismiss. A demurrer is used to challenge the legal sufficiency of the complaint, while a motion to dismiss is used to challenge the facts stated in the complaint. Both types of motions must be accompanied by an affidavit, which is a sworn statement by the party filing the motion that all factual allegations in the complaint are true.