(Gales Creek, OR) -- A tractor mowing a field near Gales Creek in Washington County caught fire and strong winds spread the flames across seven acres on Tuesday. The person mowing the field wasn't hurt. The fire started in the rear of the tractor. Firefighters worked to contain the flames. A neighboring farmer used another tractor to plow a containment line to stop the fire's spread. The flames burned near power lines, but they weren't damaged by the fire.