A firefighter uses a drip torch to ignite dry brush near in Nutrioso on Friday, June 10, 2011. Firefighters took advantage of the calm conditions to set backburn operations. Jill Torrance/Arizona Daily Star

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.

Want to share an important event from Tucson's history? Email it to krumore@azstarnet.com.