If any such special tax bills be unpaid on the first day of February after becoming payable, the commissioners shall cause suits to be instituted for foreclosure of the lien thereof. Such suits shall be instituted in the circuit court of the county by any attorney the commissioners may designate and to whom they shall order the county collector to deliver such unpaid special tax bills. The road district shall be plaintiff in such suits and any and all parties having an interest in the property to be affected thereby may be made defendants. In such suits, each special tax bill shall be prima facie evidence of a valid lien in favor of the district, and upon the land described therein, for the amount stated therein. In every suit so instituted there shall be taxed as costs, in the favor of the attorney instituting the suit, a reasonable attorney’s fee, to be fixed by the court.