Record Data Place Unit Type City or Town Containing Unit Pima County, AZ Events Date Type 05/20/1862 In Arizona, the California Volunteer Cavalry retake Tucson without firing a shot Battles/Soldiers People Documents Date Title 10/11/1858 San Francisco (CA) Evening Bulletin, “Time Table by the Butterfield Overland Mail Route,” October 11, 1858 Images Tucson, Arizona, 1862