Originally dispatched as the 4th due Engine Company for a house on fire in the rear of #12 Bayou Avenue, Engine 331 wound up assuming 3rd due responsibilities and covering the rear. After coming in from the adjacent street and entering the yard over a ground ladder, the Engine Company cleared the basement and advanced up to extinguish the rear porch that was on fire. The attack line from 33 was then moved inside so the crew could cover any potential extension. Units operated for approx. 1 hr before returning to service.