1850: Yuma Indians attack the ferry at Yuma Crossing. Fifteen people are killed and three reach safety on the west coast.

1886: Fire destroys a block of business buildings in Phoenix. The town had no fire department or water works.

1919: The Arizona Daily Star reports that tests and experiments are to be conducted for the first time concerning the use of airplanes to spot forest fires and transport firefighters.

1923: The Steward Observatory, located on the University of Arizona campus near the Mall and North Cherry Avenue, is formally dedicated. It contains a 36-inch telescope using the first large telescope mirror cast in the United States. Construction began in 1916 with a gift of $60,000 by Lavinia Steward, an amateur astronomy buff, in honor of her late husband, Henry. The telescope is transferred to Kitt Peak in 1962 and remains in use today.

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