Tongue River Massacre (1820)

Tongue River Indian massacre
Date	1820
Location	Tongue River in either Wyoming or Montana
Result	Cheyenne and Lakota victory
Belligerents
Cheyenne and Oglala Lakota	Crow Nation
Commanders and leaders
Unknown	Unknown
Strength
The whole Cheyenne tribe, a camp of Lakotas	100 tipis in camp
Casualties and losses
Most likely very few, if any	All the men killed. An unknown number of women and/or children already taken captive killed

The Tongue River massacre was an attack by Cheyenne and Lakota on a camp of Crow people in 1820. According to some accounts, it was one of the most significant losses of the Crow tribe.^{: p. 190}