US ResearchConflictsColonial and Pre-ColumbianCowboy Wash Massacre
Colonial and Pre-Columbian

Cowboy Wash Massacre

1150
Colorado
Era
Colonial and Pre-Columbian
Year
1150
Location
Colorado
Status
Historical record
The Combatants

Who Fought

Defeated
Ancestral Puebloan household group
Forces
small Pueblo II household (~7–12 individuals)
VS
Victor
Unknown attackers
Forces
Unknown
Outcome
Remains of approximately 24 individuals found in three pit structures showing systematic defleshing, marrow extraction, cooking, and discard. All bones show processing consistent with cannibalism following massacre.
The Battle

History & Significance

Excavated by Brian Billman (Soil Systems Inc.) in 1994 before construction. 24 individuals in three structures show the most chemically confirmed case of cannibalism in Ancestral Puebloan archaeology: Turner and Turner's indicators plus a human myoglobin test of coprolite from one structure (Marlar et al. 2000, Nature). Dated to c.1150 CE. One of approximately 76 similar processing assemblages Turner documented across the Southwest. Site now destroyed by construction.

Historical context

Indigenous peoples had inhabited North America for at least 15,000 years before European contact, developing complex societies across every region of the continent. The Mississippian culture, centered on the city of Cahokia near present-day St. Louis, reached its peak around 1100 AD with a population estimated at 10,000 to 20,000 — larger than contemporary London. The Ancestral Puebloans built multi-story stone complexes at Chaco Canyon and Mesa Verde between the 9th and 13th centuries. The Iroquois Confederacy, formed between roughly 1450 and 1600, united five nations under a constitution that influenced later American democratic thinking. Across the eastern woodlands, the Great Plains, the Pacific Coast, and the Southwest, hundreds of distinct nations maintained sophisticated trade networks, agricultural systems, and governance structures. European contact beginning in the late 15th century introduced epidemic disease — smallpox, measles, influenza — which devastated Indigenous populations by an estimated 50 to 90 percent within a century.

Casualties & Losses

24 individuals confirmed

Questions & Answers

Frequently Asked Questions

When did Cowboy Wash Massacre take place?
Cowboy Wash Massacre took place in 1150.
Where was Cowboy Wash Massacre fought?
Cowboy Wash Massacre was fought in Colorado, United States.
What was the outcome of Cowboy Wash Massacre?
Remains of approximately 24 individuals found in three pit structures showing systematic defleshing, marrow extraction, cooking, and discard. All bones show processing consistent with cannibalism following massacre.
What was the significance of Cowboy Wash Massacre?
Excavated by Brian Billman (Soil Systems Inc.) in 1994 before construction. 24 individuals in three structures show the most chemically confirmed case of cannibalism in Ancestral Puebloan archaeology: Turner and Turner's indicators plus a human myoglobin test of coprolite from one structure (Marlar
More from this era

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Wason Park Massacre (Pueblo I)
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Duckfoot Site Raid
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Sacred Ridge Massacre – Colorado
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Yellow Jacket Pueblo Violence
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Mancos Canyon Massacre
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Dolores River Valley Conflict Sites
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Mancos Canyon Cannibalism/Massacre Site
1150
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Cowboy Wash Cannibalism/Warfare Site
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Grinnell Site Massacre
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Crow Canyon Area Violence — Loomis Village
1200
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Mesa Verde Cliff Palace Defensive Occupation
1200
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Goodman Point Pueblo Fortification
1200
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Rattlesnake Ruin Massacre – Colorado
1200
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Hovenweep Castle Defensive Conflict
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Sun Temple — Mesa Verde Defensive
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All battles in Colorado
Source

Content adapted from Wikipedia under the Creative Commons Attribution-ShareAlike 4.0 International License.

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