(A platoon) Engine 85 was dispatched to assist Station 66 (Muhlenberg) for RIT at a working structure fire. Upon arrival, the crew set up RIT and were in the process of doing a 360 when command advised the crew to assist with fire attack. The crew from Engine 85 pulled a line to the second floor, encountering heavy fire. Fire was quickly knocked down. After assisting with overhaul command released Engine 85.