Section 20
SEC. 20. It shall be lawful for the governor of the province, or any district governor therein, to secure the enforcement of law and order in cases of resistance to lawful authority or disturbances of the peace which the Constabulary and municipal police are unable, or find it difficult, to suppress, by requesting and obtaining the assistance of the Army of the United States, by making application to the military commander of any district or the commander of the Department of Mindanao in any form and under any conditions prescribed in the general orders of the Commanding General of the Division of the Philippines.