And be it enacted, That if any Person being in the Commission of a Trespass shall assault or obstruct any Person acting in the Execution or in virtue of the Powers and Provisions of this Act, such Person, on being convicted thereof before Two Justices of Peace, on Proof on Oath by One or more credible Witness or Witnesses, or Confession of the Offence, or upon other legal Evidence, shall forfeit and pay any Sum not exceeding Five Pounds, over and above any Penalty which he may have incurred by contravening this Act, and in default of Payment thereof at such Time as to the said Justices may seem fit, shall be imprisoned in the Common Gaol or House of Correction (with or without hard Labour) for a Period not exceeding Three Months.