Mining and ranching were the primary occupations of traditional Arizona's inhabitants, though growing citrus fruits had long been occurring in Tucson.
The closure of the mail line was one of the main reasons Arizona would secede from the Union and petition to join the Confederate States.
The aim of becoming a separate American territory was realized after the First Battle of Mesilla when future governor, John R. Baylor defeated the Union garrison of Fort Fillmore with help from Arizonan militia.
Despite Tucson's presidio walls, the fortress had no garrison at the time of secession and therefore was an open city at first until the creation of a small militia force.
Tucson's militia rescued the Tubacans during the Siege of Tubac in spring of 1861 under the command of Captain Granville Henderson Oury.
Not long after the official creation of Confederate Arizona in early 1862, Texan and Arizonan rebels defeated a Union cavalry patrol at the Battle of Canada Alamosa.
Ultimately his army, comprising many Arizona militia, with supplies scarce in the region, won a tactical victory at the Battle of Glorieta Pass, but was forced to withdraw due to the loss of provisions.
The Californians under Colonel James H. Carleton captured the Confederate Fort Yuma on traditional Arizona's side of the Colorado River.
Before the Californian invasion, the Union had sent spies into the region, with the mission of procuring supplies of food and hay for the California Column.
Their mission was to wait for the California Column, and upon sighting it, return to Tucson to alert Captain Sherod Hunter and his men.
The lieutenant later reported that the Californians surrounded Tucson and then launched a full attack with infantry and cavalry, fully expecting to fight a battle.
In May, a foraging party of Sherod Hunter's company fought two engagements with Apaches in the Dragoon Mountains of traditional Arizona.
In his defence he talked about the basic American principles of Life, Liberty and the Pursuit of Happiness; after the judge heard this Mowry was released.
They felt that eastern New Mexico Territory was a place of great American progress on the frontier while the southwestern area, known as Arizona, was a war zone, unsuitable for life, without contact with the east and without protection against Apaches.
This meant Arizona no longer bordered Texas, and the Arizonans of Mesilla, Pinos Altos and other towns were forced to remain New Mexican citizens.