Just after 1200 Truck 28 was dispatched as the first due truck to the 1500 blk of 1st Street in Glenarden. The first arriving engine reported a fire in the walls near the chimney. Truck 28 arrived and forced entry into the house and began searching and opening up to find the fire. The fire was isolated to the walls and floor around the chimney. The Truck crew assisted with overhaul and returned to service shortly after.