The Great Chicago Fire of 1871 was a devastating fire that burned most of the city of Chicago to the ground. It started on October 8th and burned until October 10th, destroying over 3.5 square miles of the city. The fire was likely started by a barn fire in the southwest side of the city, and windy, dry conditions helped the fire spread rapidly. Within a few hours it had consumed much of the city. Over 300 deaths resulted from the fire and an estimated 100,000 residents were left homeless. The fire demonstrated the need for improved fire safety practices and construction techniques in urban areas. It was a catastrophic event that reshaped the city of Chicago.