Johnston's Army

Utah War
Part of the Mormon wars
Date March 1857 – July 1858 Location Utah Territory present day Utah & Wyoming Result Resolution through negotiation; Brigham Young replaced as Governor of Utah Territory Full amnesty for charges of sedition and treason issued to the citizens of Utah Territory by President James Buchanan on the condition they accept U.S. Federal authority
Belligerents
United States Utah Territory	Deseret / Utah Mormons (Nauvoo Legion)
Commanders and leaders
Pres. James Buchanan Gov. Caleb Walton West Gen. Albert S. Johnston	Gov. Brigham Young Gen. Daniel H. Wells Cap. Lot Smith
Strength
2,500	unknown
Casualties and losses
38	Unknown
Civilians: 126 killed (120 in Mountain Meadows Massacre)

Resolution through negotiation;

 United States

The Utah War (1857–1858), also known as the Utah Expedition,Utah Campaign,Buchanan's Blunder, the Mormon War, or the Mormon Rebellion was an armed confrontation between Mormon settlers in the Utah Territory and the armed forces of the United States government. The confrontation lasted from May 1857 to July 1858. There were some casualties, mostly non-Mormon civilians. The war had no notable military battles.

In 1857-1858, President James Buchanan sent U.S. forces to the Utah Territory in what became known as the Utah Expedition. The Mormons, fearful that the large U.S. military force had been sent to annihilate them and having faced persecution in other areas, made preparations for defense. Though bloodshed was to be avoided, and the U.S. government also hoped that its purpose might be attained without the loss of life, both sides prepared for war. The Mormons manufactured or repaired firearms, turned scythes into bayonets, and burnished and sharpened long-unused sabres.

Rather than engaging the enemy directly, Mormon strategy was one of hindering and weakening them. Daniel H. Wells, lieutenant-general of the Nauvoo Legion, instructed Major Joseph Taylor:

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Wikipedia