1856: Camp Moore in the Sonoita Valley is renamed Fort Buchanan.
1873: A troop of the 5th Cavalry establishes a camp on the San Carlos River near Gila. It becomes the headquarters for the military government of the San Carlos Indian Agency.
1895: The University of Arizona holds its first commencement with three graduates.
1939: The first radio transmission by Tucson Police Department is recorded when Officer Oliver White sends a radio message to Car 29 requesting help in investigating a report of racing motorcyclists near Tyndall Ave. and 7th Street. (from "The book of Tucson firsts" by Larry Cox)
2011: The Wallow Fire, which becomes the largest recorded Arizona wildfire after burning 538,049 acres in eastern Arizona over 41 days, is sparked in eastern Arizona.
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