Fire in a field near the St. Croix-Pierce county line was extinguished Tuesday after a combine caught fire. United Fire Chief Gary Newton said fire crews responded to a minor fire Oct. 16 in a field on County Road Y in the town of Rush River. A small fire began near a bearing on the combine's corn head, which threw sparks that ignited some corn stalks, Newton said. Firefighters from United's Baldwin station, along with River Falls fire department crews extinguished the flames. Newton said damage to the combine was minor.