Rochester firefighters were called to assist Durham with a large barn fire early yesterday evening. Crews were initially requested for station coverage but were bumped to the scene when Durham struck the 4th alarm. At that time they also requested our tanker for more water. Engine 7 joined Engine 3 already on the scene. Off duty personnel were called back to cover the city and other calls that continued while the on duty crew responded to Durham. Crews were released just after 9:00pm after a strong effort by all.