"The Saturday Night Fire," which burned four blocks in Greektown, left 30 of Chicago's 185 fireman injured, and many more exhausted, the day before the Chicago Fire in 1871.

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The fire started around 10pm on October 7, 1871, the day before the Chicago fire.

According to greatchicagofire.org:

The neighborhood was popularly known to insurance brokers as the "Red Flash" because of the combustibility of the local buildings and their contents. It was well into Sunday afternoon before this fire was extinguished, by which time four square blocks and close to a million dollars in property had gone up in smoke.