The Colorado Coalfield War

The Colorado Coalfield War of 1913 to 1914 was not a labor dispute in any ordinary sense of the term. It was a fourteen-month armed conflict between a private corporation and the workers it employed, conducted on the territory of Las Animas and Huerfano counties in southern Colorado, in which the governor of the state deployed the National Guard on behalf of one side, the federal government eventually intervened with Army troops to suppress the other, and nineteen people were killed in a single incident on April 20, 1914, that became the most visible symbol of what the American coal industry had become. The corporation was Colorado Fuel & Iron, majority owned by interests connected to John D. Rockefeller Jr. The workers were miners. The incident was the Ludlow Massacre. The union was the United Mine Workers of America. None of the principals received what they were seeking when the conflict ended. The dead remained dead.

The archive presents this record in full because the coalfield war was the defining event in Colorado's labor history, because it took place across the landscape that this publication covers, and because the physical sites where it unfolded remain accessible today — Cokedale, Ludlow, the canyon roads above Trinidad, the Huerfano Valley — in ways that make the event possible to understand from the ground rather than only from a library. What follows is the complete record: the cause, the event, the massacre, the aftermath, and the reckoning that came slowly and without satisfaction to most of those who survived it.

The System That Produced the War

To understand the coalfield war, you have to understand the company town. Colorado Fuel & Iron operated the largest collection of coal mines in the state and did so through a system of total dependency that is difficult to fully grasp from a contemporary vantage point. CF&I owned not just the mines but the land the mines sat on, the houses the miners lived in, the stores where they bought food and equipment, the schools where their children were educated, the doctors who treated their injuries, and the guards who enforced the company's rules. Workers were paid in scrip — a form of currency redeemable only at CF&I stores — which meant that wages and the cost of living were both controlled by the same employer. A miner who challenged conditions could be fired, evicted from his house, and removed from the company town within the same twenty-four hours. His children would be removed from the company school. His family would lose access to the company doctor.

This system prevailed across roughly thirty individual mine sites in Las Animas and Huerfano counties, operating under various CF&I property names — Ludlow, Berwind, Hastings, Tercio, Cokedale, Starkville, and more than a dozen others. The workforce was overwhelmingly immigrant: Italian, Greek, Slavic, Austrian, and Mexican miners recruited by CF&I labor agents who traveled to Eastern Europe and the American Southwest specifically to fill the workforce in a part of Colorado where the labor supply was otherwise insufficient for the company's production ambitions.

The United Mine Workers of America had been attempting to organize this workforce since the early 1900s. CF&I responded to every prior organizing effort with the tools available to it: eviction, blacklisting, the importation of non-union labor, and the use of company guards and county officials — in Huerfano and Las Animas counties, the sheriffs were effectively CF&I employees — to suppress union activity. The UMWA called a strike in 1903 and failed. It returned in 1913 with better organization, more resources, and a clearer public relations strategy. CF&I had the advantage of terrain, money, and the state government. What the UMWA had was the arithmetic: if the miners walked out together, across all the camps at once, the production disruption would be severe enough to force a negotiation.

The Strike Begins: September 1913

The UMWA issued its strike call on September 23, 1913. The demands were straightforward: recognition of the union, a ten percent wage increase, an eight-hour workday (already required by Colorado law but not enforced at CF&I mines), the right to trade at non-company stores, and the right to choose their own boarding houses and doctors. CF&I rejected the demands in their entirety and refused to meet with UMWA representatives. The company's position was that it would negotiate with its own employees individually, not with a union, and that its employees had no legitimate grievances that its own management had not already addressed.

When the miners walked out, CF&I exercised the eviction clause: miners and their families were removed from company houses within days. The UMWA had prepared for this. In the months before the strike call, the union had quietly established tent colonies on land it leased outside the CF&I property boundaries — at Ludlow, at Walsenburg, at Forbes, and at several other locations — where evicted miners and their families could shelter. The tent colony at Ludlow, on a piece of land near the main road north of Trinidad, became the largest and the most significant. At its peak it housed more than a thousand people.

The archive holds a first-person account from a survivor of the Ludlow colony — a woman who was eleven years old when she arrived there with her family in the fall of 1913 and who was present on April 20, 1914. Her account was collected in 1944 and is one of the few existing survivor testimonies from the colony itself.

Escalation: Autumn and Winter 1913

The early months of the strike were violent. CF&I used its company guards — a private security force that operated under the legal fiction of being deputized by the county sheriffs — to harass the tent colonies, intimidate returning strikers, and protect the replacement workers the company imported from outside Colorado. UMWA members were armed and organized into a rough defensive posture around the colonies. Exchanges of gunfire between strikers and guards began in the first weeks of the strike and continued sporadically through the winter.

Mother Jones — Mary Harris Jones, then in her late seventies and the most prominent labor organizer in the country — arrived in the Trinidad coalfield in August 1913, before the strike began, to address the workers and organize their resolve. She was arrested twice during the strike period by Colorado authorities acting on CF&I's behalf, once placed under house arrest in a Trinidad hotel, and became a national figure through the coverage her treatment received in the Eastern press. Her presence in the coalfield was both practically useful to the UMWA and symbolically important as a demonstration that the strike was not a local matter.

Governor Elias Ammons declared martial law in the strike zone in late October 1913 and sent the Colorado National Guard to the area. The Guard's commander, Adjutant General John Chase, was openly sympathetic to CF&I's position. Under Chase's command, the Guard arrested UMWA leaders, deported organizers from the state, and used its authority to restrict the movement of miners in and out of the tent colonies. CF&I provided the Guard with logistical support including food and housing, an arrangement that became a subject of congressional inquiry the following year.

April 20, 1914: The Ludlow Massacre

By the spring of 1914, the Colorado National Guard's presence in the strike zone had been reduced due to the cost of the deployment. The remaining Guard unit at the Ludlow colony was the company-funded portion — effectively a reconstituted version of CF&I's own guards operating under military authority. On the morning of April 20, 1914, a confrontation between this unit and armed miners near the Ludlow colony escalated into an exchange of gunfire. The precise sequence of events remains disputed; both sides accused the other of firing first.

What is not disputed is what followed. During the firing, the women and children of the colony sheltered in pits beneath the tents — holes dug in the tent floors as a precaution against exactly this kind of attack. The tents were set on fire, apparently deliberately, late in the day. When the firing stopped and rescuers reached the colony, they found the bodies of two women and eleven children in one pit beneath a burned tent. Four men were also killed in the fighting, including the colony's leader, Louis Tikas, who was taken prisoner by the Guard and shot. In total, nineteen people died at Ludlow on April 20, 1914.

The news of Ludlow reached the country within days. The New York newspapers covered it on their front pages. Congress called hearings. The Rockefeller family, whose connection to CF&I was extensively documented in the press, became the subject of sustained public criticism that would eventually result in John D. Rockefeller Jr. hiring Ivy Ledbetter Lee — one of the founders of modern public relations — to manage the company's image and commissioning the sociologist W.L. Mackenzie King to develop what became known as the Rockefeller Industrial Relations Plan, a company-sponsored employee representation program designed to provide the appearance of collective bargaining without the substance of an independent union.

The Ten Days' War: April–May 1914

The immediate response to Ludlow in the southern coalfield was an armed uprising. Within days of the massacre, miners across Las Animas and Huerfano counties armed themselves, attacked mine infrastructure, drove off or killed company guards, and attempted to seize control of the physical territory of the coalfield. The conflict lasted approximately ten days, covered hundreds of square miles of mountain terrain, and resulted in additional deaths on both sides. It was, by any conventional military standard, an insurrection — a coordinated armed attack on corporate and quasi-governmental authority by a civilian population responding to violence against their families.

President Woodrow Wilson sent federal troops to Colorado on April 30, 1914. The Army's arrival ended the armed phase of the conflict. The miners stood down in the face of federal military authority in a way they had not stood down for the Guard, partly because the federal soldiers were perceived as less overtly aligned with CF&I than the state troops had been. The tent colonies were dissolved. UMWA members returned to their evicted status — without homes, without recognition, without any of the demands they had struck for the previous September.

The Aftermath: What Changed and What Did Not

The Congressional hearings on the coalfield war in 1914 and 1915 documented in considerable detail the conditions in the CF&I mines, the company's use of private security forces in coordination with state authorities, and the specific events at Ludlow. No criminal charges resulted. The National Guard officers responsible for the April 20 attack were court-martialed in a military proceeding that resulted in no convictions. The CF&I guards involved were never charged. Louis Tikas, the miner executed after his capture, was the subject of an inquest that returned an open verdict.

The UMWA did not win recognition from CF&I in 1914 or for decades afterward. The Rockefeller Industrial Relations Plan — the company union established in 1915 — was implemented at CF&I mines as a substitute for independent representation and remained in place until the National Labor Relations Act of 1935 changed the legal landscape for labor organizing nationally. The miners who had struck in 1913 and survived the strike were mostly blacklisted; most did not return to CF&I employment.

What changed was harder to quantify. The Ludlow Massacre became a permanent fixture in American labor history, cited in every subsequent discussion of mine safety, company towns, and the legitimate use of force against workers. The public relations crisis created by Ludlow contributed directly to the development of the modern practice of corporate communications — Ivy Lee's work for the Rockefellers in 1914 is considered a foundational moment in that profession's history, which is one of the stranger afterlives any massacre has produced. The UMWA used the Coalfield War as a recruitment and organizing argument for the next generation and eventually organized the southern Colorado mines, though not until the 1930s.

The tent colony sites were abandoned. The company towns were worked until the economics no longer justified them and then abandoned in turn. The mines closed. The towns became ghost towns or were erased entirely. The names remain on maps — Ludlow, Hastings, Tercio, Berwind, Starkville — and on the gravestone markers in the small cemeteries scattered through the canyons above Trinidad, where the surnames trace the immigration routes CF&I used to fill these mines with workers who had no language for what they were walking into.

Primary Sources in This Archive

The archive holds several primary source documents relating to the coalfield war and the longer labor history of southern Colorado. These are recovered materials — survivor accounts, correspondence, field records — that have not previously been published. The Ludlow survivor account, collected in 1944, documents the experience of the tent colony from the perspective of a child who was present on April 20, 1914. A militiaman's letter from the Beaver Creek engagement of 1885 documents an earlier episode of the same conflict between capital and labor in the Huerfano Valley. Additional primary source materials are being prepared for the archive and will be linked from this record as they are completed.