Any person who is requested or ordered by any magistrate or peace officer to render the magistrate or officer assistance in making or attempting to make an arrest, or to prevent the commission of any criminal act, shall render assistance as required. It is violation of this code for a person who unreasonably and without lawful cause, refuses or neglects to render assistance when so requested. (See Title B, Chapter 2, § 1.27 or Iowa Code § 719.2.)