Station 3 was dispatched to the 2200 block of Georgetown Drive in Tredyffrin Twp around 7p.m for a house.  Several calls reported a working dwelling fire.  Chief 3 was advised of the reports and requested mutual aid from Berwyn Fire Company and Malvern Fire Company.  Chief 3 arrived on location and confirmed the report of the rear of the house on fire.  Engine 3-1 arrived on scene and pulled an 2 1/2" water line and went inservice.  Engine 2-2, and Tower 3 assisted Engine 3-1's crew with additional hand lines, and extension in the dwelling.   Crew's remained on scene for an extended period of time assisting in overhaul and assisting the Fire Marshals office.