As military commissions have been revived in the wake of the attacks of September 11,2001, interest has grown in the history of the institution. The United States Supreme Court, in Hamdan v. Rumsfeld, sketched out some historical notes and set forth a tripartite division between law-of-war commissions, martial law commissions, and occupation tribunals. Various authors have advanced insights on this history, though most have focused on the prominent episodes, particularly the handful of Supreme Court cases. Even the most comprehensive article gives short shrift to the massive employment of commissions in the Reconstruction era and in postwar Germany. This essay attempts to advance the cause by sketching out the entire scope of the institution’s history and indicating what further research would have to be done to arrive at a truly comprehensive treatment. A basic difficulty is that the work product of military commissions is not encompassed in a series of trial reports like the Federal Supplement or the military’s own Court-Martial Reports. A handful of cases wound up in the Supreme Court and another half dozen stood out enough to attract historians’ interest. Otherwise, commission proceedings are memorialized, if at all, only in military general orders and records of trials that were maintained in the Office of the Judge Advocate General. I have explored the records pertaining to commissions in the Reconstruction period following the Civil War in anticipation of writing a comprehensive article. It is a difficult and time-consuming task. To complete the picture, similar pick-and-shovel work would have to be done on such extensive use of the commission as occurred in Germany after World War II. Both the Civil War-Reconstruction period and the German occupation produced thousands of trials.