Two firefighters were hurt and an unknown number of calves and cows died in a barn fire Friday evening in the town of Hartford. According to a release from the City of Hartford Fire and Rescue, one of the property owners called authorities at 5:48pm reporting a barn fire at 7236 Arthur Road in the Town of Hartford. He stated a tractor was on fire inside the 200 by 200 foot cow barn and that there were cows inside the barn. Shortly after the initial call, a second call came in reporting the barn was totally engulfed. Upon arrival fire crews focused efforts on rescuing livestock that was still inside the barn and also focused on preventing the fire from spreading to an attached barn. The initial investigation has determined that the tractor that had been recently used started on fire while sitting idle inside the barn. Nearly a dozen area fire departments from around Washington, Dodge and Waukesha counties responded to fight the blaze. Two firefighters were transported to Aurora Medical Center in Hartford to be treated for minor injuries .Crews remained on the scene for six hours. Preliminary damage estimates exceed one million dollars. Three of the four structures are considered a total loss. There were animals that did perish in the fire and some will need to be euthanized but at this time how many is unknown.