(a) If the persons assembled do not immediately disperse, the officers must arrest them or cause them to be arrested, that they may be punished according to law, and for the purpose may command the aid of all persons present.
(b) If the persons assembled and commanded to disperse do not immediately disperse, any two of the officers mentioned in section 4021 of this title, may command the aid of a sufficient number of persons, armed or otherwise, as may be necessary, and may proceed in such manner as in their judgment may be most expedient to disperse the assembly and arrest the offenders.