Montana Code Annotated § 45-5-201. Assault
(1) A person commits the offense of assault if the person:
(a) purposely or knowingly causes bodily injury to another;
(b) negligently causes bodily injury to another with a weapon;
(c) purposely or knowingly makes physical contact of an insulting or provoking nature with any individual; or
(d) purposely or knowingly causes reasonable apprehension of bodily injury in another.
(2) A person convicted of assault shall be fined not to exceed $500 or be imprisoned in the county jail for any term not to exceed 6 months, or both.