At 13:32 hours Station 15 was alerted to assist Stations 1 & 27 on a working barn fire (69D7). Trooper 4 advised fire showing at 13:37 hours. Medic 5D arrived on scene and advised several barns on fire at 13:37 hours. Ladder 15-7 responded at 13:35 hours and 15-4 responded at 13:37 hours. B-15 was dispatched at 13:38 hours for BLS standby. Chief 27-8 (Bailey) assumed command and placed Chief 24-8 (Lynch) as Water Supply Officer. 15-7 arrived on scene at 13:48 hours and was placed into service by Command. 15-4 arrived at 13:51 hours and was part of the water supply. Command placed the scene under control at 15:53 hours. Station 15 units cleared the scene at 17:34 hours. B-15 and Medic 5D evaluated 5 firefighters but all refused treatment. B-15 cleared the scene at 17:46 hours. Total of 17 members responded. Engine 10-5 provided the cover up for station 15. Units responding: 15-4, 15-7 and B-15