When did the Great Chicago Fire occur?

Context: He assumed the presidency of the Commercial Insurance Company, then was named president of the Chicago Board of Underwriters in 1869. Following the Great Chicago Fire of 1871, he was named the president of the State Savings Institution, resigning in 1873. Dore also presided over the Newsboys' and Bootblacks' Home and donated a building to them in 1884.

Answer: 1871