Use of military force to disperse riots, etc

Before using any military force in the dispersion of any riot, rout, tumult, mob or unlawful assembly, or combination mentioned in this article, it shall be the duty of the civil authorities present, or if none be present, then of the officer in command of the troops, or some person by him deputed, to command the persons composing such riotous, tumultuous or unlawful assembly or mob to disperse and retire peaceably to their respective abodes and business; but in no case shall it be necessary to use any set or particular form of words in ordering the dispersion of any riotous, tumultuous or unlawful assembly; nor shall any such command be necessary where the officer or person, in order to give it, would necessarily be put in imminent danger of loss of life or great bodily harm, or where such unlawful assembly or mob is engaged in the commission or perpetration of any forcible or atrocious felony, or in assaulting or attacking any civil officer or person lawfully called to aid in the preservation of the peace, or is otherwise engaged in actual violence to persons and property.