At 1333 hours, Box 46-2, sent Hummelstown and area companies to the 100 block of N. Duke Street for a residential structure fire. Company 46 (Hummelstown), Engines 47-1 (Union Deposit), 91-5 (Rutherford), Rescue 88 (Middletown), Tankers 59 (Lower Swatara), 47 (union Deposit), and Air 48 (Hershey) were dispatched on the initial box. Chief 46 arrived on scene reporting a fully involved house fire and requested the first alarm assignment. Engine 48 and Truck 48 (Hershey), and Rescue 59 (Lower Swatara), 48 (Hershey) responded as the working fire companies. Truck 34 (Paxtonia) and Air 41 (Bressler) also responded in on the box. Engine and Truck 46 took a position on side A, secured water, and stretched a line to the second floor in attempt to make a knock on the main body of fire. Engine 91-5 took a position in the rear and also stretched a line to side C. Heavy fire consumed the second floor rear and extended to the attic of a 2.5 story, occupied, single family, dwelling. Interior crews reported the stairs from the 2nd floor to the attic were burned through and companies could not access the attic from the interior. Several additional lines were stretched and the roof opened before the bulk of the fire could be knocked down and overhaul operations completed. All searches negative and the fire placed under control at 1551 hours.