Verdict Pending for 129 Years:

The 1993 Posthumous Trial of Henry Plummer and the Reexamination of the Montana Vigilantes

Background: The Hanging That Would Not Stay Buried

On the morning of January 10, 1864, a group of armed men arrived at the home of Henry Plummer, the elected sheriff of Bannack, in what was then Idaho Territory and would within months become Montana Territory. They arrested him without warrant, marched him to the gallows he had helped construct, and hanged him alongside his deputies, Buck Stinson and Ned Ray. No formal charges were read. No witnesses testified under oath. No defense was offered. Within hours, the same Vigilance Committee of Alder Gulch that had organized only weeks before would repeat variations of this scene across the gold camps of southwestern Montana, executing at least twenty men in roughly six weeks in the winter of 1863-1864. The man they considered the ringleader of a network of road agents died without a trial, and that absence of due process would echo through Montana history for well over a century.

The primary narrative of these events was set early and set firmly. Thomas J. Dimsdale, an Oxford-educated English immigrant who served as editor of Montana’s first newspaper, the Montana Post, published a series of articles in 1865 that were collected the following year into The Vigilantes of Montana, the first book printed in the territory. Dimsdale’s account portrayed Plummer as the cunning mastermind of a criminal gang known as the Innocents, responsible for over one hundred murders and countless robberies. Nathaniel P. Langford, a vigilante member who later became the first superintendent of Yellowstone National Park, reinforced this account in his own memoir. Because both men wrote from within the vigilante circle, and because dissenters faced lethal consequences, the official version of events went largely unchallenged for more than a century. Plummer was a villain. The vigilantes were founders (Dimsdale, Thomas J. The Vigilantes of Montana. Montana Post Press, 1866).

The Revisionist Challenge: Mather, Boswell, and the Question of Evidence

The first sustained scholarly challenge to the Dimsdale-Langford version came in 1987, when R. E. Mather and F. E. Boswell published Hanging the Sheriff: A Biography of Henry Plummer through the University of Utah Press. Drawing on eyewitness accounts, contemporary newspaper records, diaries, and court documents that previous historians had largely ignored or dismissed, Mather and Boswell argued that the conventional account of Plummer’s villainy rested on an unsubstantiated and self-serving accusation, made by men who had everything to gain from Plummer’s elimination and nothing to lose from his death. As a review in the Western Historical Quarterly noted, the authors rejected the claim that a reign of terror had necessitated vigilante action in the first place, pointing out that formal law had already been established at Bannack through miners’ courts, Plummer’s own election as sheriff, and the arrival of a territorial judge (Mather, R. E., and F. E. Boswell. Hanging the Sheriff: A Biography of Henry Plummer. University of Utah Press, 1987).

Mather and Boswell’s central argument was political as much as evidentiary. Plummer was a Democrat in a territory whose most powerful men, including Wilbur Fisk Sanders, who would eventually become Montana’s first United States senator, and Sidney Edgerton, who would become its first territorial governor, were staunch Republicans with considerable political ambitions. In this reading, the vigilante campaign was not simply a law enforcement response to criminal activity but a calculated effort to remove a popular political rival whose electoral success and growing influence posed a direct threat to Republican consolidation of power in the territory. The Innocents, in Mather and Boswell’s analysis, were never the organized syndicate described by Dimsdale, and the death toll of over one hundred attributed to the gang was a dramatic exaggeration designed to justify extrajudicial killings that were, in reality, far more calculated and politically motivated than the sanitized narrative suggested.

The 1987 book was followed by a companion volume, Vigilante Victims: Montana’s 1864 Hanging Spree, published in 1991, which extended the revisionist analysis to several of the other executions carried out by the vigilance committee, arguing that many of the men hanged alongside Plummer were not road agents at all but political inconveniences, personal enemies, or simply men who had made the mistake of expressing skepticism about the committee’s authority. Not all professional historians accepted these conclusions. Frederick Allen, in his 2004 book A Decent, Orderly Lynching: The Montana Vigilantes, published by the University of Oklahoma Press, credited Mather and Boswell with important archival work while concluding that their portrait of Plummer as a wronged innocent was as one-sided as Dimsdale’s portrait of him as an outlaw chief. Allen’s own careful examination of original sources led him to conclude that the vigilantes were likely justified in their initial actions against genuine criminal elements, even as they subsequently overreached, remaining active for years after territorial courts were in operation and executing more than fifty men in total without legal process (Allen, Frederick. A Decent, Orderly Lynching: The Montana Vigilantes. University of Oklahoma Press, 2004).

The 1993 Trial: A Classroom Question Reaches a Courthouse

By the early 1990s, the debate over Plummer’s guilt had moved beyond academic journals and into the broader cultural conversation about Montana’s origins. It was in this context that a teacher at Twin Bridges Public Schools in Madison County, Montana, assigned a research project that asked students to examine the historical evidence on both sides of the Plummer case. Twin Bridges is a small town situated near the confluence of the Ruby, Beaverhead, and Big Hole rivers, fewer than thirty miles from Virginia City and Bannack, the sites of the original vigilante executions. The proximity of the community to the events in question gave the exercise an immediate local resonance that a more distant school district could not have provided.

The project grew into something considerably larger than a classroom exercise. On May 7, 1993, a full posthumous mock trial of Henry Plummer was staged inside the Madison County courthouse in Virginia City, the same historic building that had served Madison County since the territorial period. The proceeding drew national media attention. Participants included both students and adults, who reenacted the roles of prosecutors, defense counsel, and witnesses, drawing their arguments and testimony from the historical record as compiled by Dimsdale, John X. Beidler, Langford, and the revisionist sources. A jury of twelve registered voters, four men and eight women, was impaneled to hear the case (Montana Vigilantes. Montana Historical Society. https://mhs.mt.gov/education/StoriesOfTheLand/Part2/Chapter6/Ch6Educators/vigilantes. Accessed 15 March 2026).

After six hours of testimony and argument, the jury retired to deliberate. When it emerged, the vote stood at six for conviction and six for acquittal. Judge Barbara Brook declared a mistrial. Under American legal convention, had Plummer been alive, the deadlock would have meant his release, with double jeopardy protections preventing a second prosecution on the same charges. The student who had been playing the role of Plummer was told, in the formal language of the proceeding, that he was free (Mather, R. E., and F. E. Boswell. “Henry Plummer.” Wild West Magazine, Aug. 1993, www.historynet.com/henry-plummer/. Accessed 15 March 2026).

The significance of the outcome was not lost on anyone present. A jury of Montana citizens, presented with the same body of historical evidence that had been available to scholars for years, could not reach agreement on whether the man the Montana Vigilantes had hanged in 1864 was guilty of the crimes attributed to him. The deadlock did not resolve the historical question, but it gave the question a new and public form. If twelve citizens applying the legal standard of reasonable doubt to the available evidence could not agree on guilt, the certainty with which generations of Montana textbooks had pronounced Plummer a criminal mastermind suddenly appeared less secure.

The Pardon Petition and the Board’s Response

The visibility of the 1993 trial set in motion a formal legal aftershock. Within weeks of the proceeding, academics and historians sympathetic to the revisionist position moved to petition the Montana Board of Pardons and Parole for a posthumous pardon of Henry Plummer. The petition was submitted on July 1, 1993, and was signed by R. E. Mather, along with supporting letters from Frederick Morgan, a publisher of Western history books, and Jack Burrows, a Western history professor and author. Montana Governor Marc Racicot acknowledged the petition and assured petitioners that the board would give it prompt consideration (Angelfire. “The Trial of Henry Plummer May 7th, 1993.” http://www.angelfire.com/ca/bearflag/vigilante/montana2.html. Accessed 15 March 2026).

The board’s response, delivered in August 1993, was unambiguous but arrived by a route that few petitioners had anticipated. Executive Secretary Craig Thomas characterized the application as unusual, describing it as the first of its kind within his knowledge. The board declined to act not because it found Plummer guilty, but because it determined that it lacked the jurisdiction to grant a pardon at all. Under Montana law, the Board of Pardons and Parole holds authority to review requests for executive clemency only in cases where a conviction has been formally recorded. Plummer had never been convicted of any crime in a Montana court. He had been executed extrajudicially, without trial and without verdict, by a private citizens’ committee operating entirely outside the territorial legal system. Because there was no conviction on record, there was nothing for the board to pardon. The very absence of due process that had made the 1993 trial necessary in the first place also made formal exoneration legally impossible (Montana Historical Society. “More on Vigilantes and Vigilantism.” https://mhs.mt.gov/education/StoriesOfTheLand/Part2/Chapter6/Ch6Educators/vigilantes. Accessed 15 March 2026).

This jurisdictional impasse was not merely procedural. It exposed a structural problem in how American law handles historical injustice carried out outside the legal system. A pardon presupposes a conviction, which presupposes a trial. When none of these occurred, the machinery of legal redress has no point of purchase. The board’s ruling was technically correct, but it had the effect of leaving Plummer’s case in a permanent historical limbo, neither exonerated nor formally condemned by any legal authority.

Historical Stakes: What the Debate Actually Represents

The significance of the 1993 proceedings extended beyond the question of whether Henry Plummer, in particular, was guilty of the crimes attributed to him. The event crystallized a broader and more consequential debate about the founding mythology of Montana as a state. The Montana Vigilantes have occupied a distinctive place in the state’s self-understanding since the territorial period. Their symbol, the numbers 3-7-77, whose meaning remains disputed but whose function as a warning and a mark of vigilante authority was widely understood at the time, is still displayed on the uniforms of the Montana Highway Patrol today. The vigilantes are embedded in Montana’s civic culture as founding figures, men who imposed order on chaos when formal institutions could not. The revisionist scholarship of the 1980s and 1990s asked whether that founding narrative was built on a series of extrajudicial killings that were, at least in part, politically rather than criminally motivated.

The Montana Historical Society’s own educational materials reflect the persistence of this debate, acknowledging both the traditionalist position, which holds that the vigilantes acted from genuine necessity in the absence of functioning legal authority, and the revisionist challenge, which argues that their motives were more complex and their targets more indiscriminate than the standard account allows. The Society notes that mainstream historians distinguish between the early vigilante actions of 1863-1864 and the committee’s later activities in the 1870s, when formal courts were already operating and the vigilantes’ continued extrajudicial executions were considerably harder to justify on grounds of necessity (Montana Historical Society. Montana: Stories of the Land. Montana Historical Society Press, 2009).

Mark C. Dillon, a justice of the New York State Appellate Division and legal historian, has argued that the vigilantes must be evaluated against the due process standards of their own era, not those of the twenty-first century. His analysis, published as The Montana Vigilantes 1863-1870: Gold, Guns and Gallows through the Utah State University Press, examines the committee’s procedures through the lens of territorial law and finds their conduct more legally complex than either the traditionalist celebration or the revisionist condemnation fully acknowledges. This perspective provides a necessary corrective to both the hagiographic and the prosecutorial approaches to the vigilante record, situating the executions within the specific legal and political conditions of a mining territory operating without effective governmental infrastructure during a national civil war (Dillon, Mark C. The Montana Vigilantes 1863-1870: Gold, Guns and Gallows. Utah State University Press, 2013).

The Unresolved Question

The 1993 mock trial and the subsequent pardon petition produced no definitive answers, and this outcome may be historically appropriate. The primary sources on which any evaluation of Henry Plummer must rely were produced almost entirely by men who had participated in his execution and had powerful reasons to justify it. The revisionist scholarship that challenged this record brought necessary scrutiny to the evidentiary foundations of the traditional account, but it was not immune to its own interpretive pressures. What the 1993 proceedings demonstrated clearly was that the question of Plummer’s guilt, and by extension the question of the vigilantes’ legitimacy, remained genuinely open after 129 years, and that the absence of formal legal process in 1864 had not resolved but merely deferred the reckoning that a divided jury confirmed in Virginia City more than a century later. The hung verdict was not an ending. It was a precise measure of the historical uncertainty that the killings of January 1864 had always contained, and that no subsequent inquiry, legal or scholarly, has yet managed to dispel.

Works Cited

Allen, Frederick. A Decent, Orderly Lynching: The Montana Vigilantes. University of Oklahoma Press, 2004.

Dillon, Mark C. The Montana Vigilantes 1863-1870: Gold, Guns and Gallows. Utah State University Press, 2013.

Dimsdale, Thomas J. The Vigilantes of Montana. Montana Post Press, 1866.

Mather, R. E., and F. E. Boswell. Hanging the Sheriff: A Biography of Henry Plummer. University of Utah Press, 1987.

Mather, R. E., and F. E. Boswell. “Henry Plummer.” Wild West Magazine, Aug. 1993. Reprinted at HistoryNet, www.historynet.com/henry-plummer/. Accessed 15 March 2026.

Mather, R. E., and F. E. Boswell. Vigilante Victims: Montana’s 1864 Hanging Spree. History West Publishing, 1991.

Montana Historical Society. “More on Vigilantes and Vigilantism.” Montana: Stories of the Land Educator Resources, Montana Historical Society, https://mhs.mt.gov/education/StoriesOfTheLand/Part2/Chapter6/Ch6Educators/vigilantes. Accessed 15 March 2026.

Montana Historical Society. Montana: Stories of the Land. Montana Historical Society Press, 2009.

“The Trial of Henry Plummer May 7th, 1993.” Montana-Vigilantes.org, archived at Angelfire, http://www.angelfire.com/ca/bearflag/vigilante/montana2.html. Accessed 15 March 2026.​​​​​​​​​​​​​​​​