If any person shall assault or resist any Police Officer in the execution of his duty; or shall aid or incite any other person so to do; or shall maliciously and without probable cause prefer any false or frivolous charge against any Police-officer, such person shall, on conviction of such offence before any Magistrate, be liable to a fine not exceeding fifty rupees, or to imprisonment, with or without hard labour, not exceeding three months, or both.