The U.S.-Dakota War of 1862 lasted from August 17th through September 24th. It ended with 447 white people killed, more than 300 of whom were not in any battles, including at least 100 white children and 50 white women. In contrast, only 29 Dakota Indian men had been killed. The U.S. Army also captured many Dakota men, women and children.
On September 27th Henry H. Sibley, who had been appointed by Minnesota Governor Alexander Ramsey to be in charge of the militia fighting the War, issued an order creating a military commission to try the captive Dakota Indians. Another order the next day stated that the commission of five officers would “try summarily the Mulatto [Joseph Godfrey], and Indians, or mixed bloods . . . and pass judgment upon them, if found guilty of murders or other outrages [rapes] against the whites, during the present state of hostilities of the Indians . . . . [to be] governed . . . by Military Law and Usage.”
1. “Godfrey , a colored man, did at or near New Ulm, Minn., on or about the 19th day of August 1862, join in a War Party of the Sioux tribe of Indians against Citizens of the [U.S.] and did with his own hand murder seven white men and women and children more or less, peaceable Citizens of the [U.S.].”
2. “Godfrey, a colored man, did at various times and places between the 19th day of August 1862, and the 28th day of September 1862, join and participate in the Murders and Massacres committed by the Sioux Indians on the Minnesota Frontier.”
His trial on these charges started with his own detailed testimony that he had felt coerced to join the initial Dakota war party, that minimized his own participation and that he had not killed anyone, but only hit a white man with the blunt edge of a hatchet. Six witnesses testified that Godfrey had appeared to be a willing participant and had said he had killed people, but none said they had witnessed any such killings. His trial took one or two days. Thereafter, Godfrey testified in other cases on behalf of the prosecution.
The commission subsequently issued its decision that Godfrey was “guilty on the charge [of Murder], and second specification [of participation in murders and massacres by the Indians], and not guilty on the first specification [of murdering anyone himself].” The commission, therefore, sentenced him “to be hung by the neck until he is dead,” but recommended “a mitigation of the sentence to imprisonment for ten years.” 
The commission also conducted trials of 391 other Dakota Indians over no more than 30 days. Of these, 302 were convicted and sentenced to death by hanging; 20 were convicted and given prison terms of one to five years; and 69, including one Dakota woman, were acquitted.
After all the cases had been tried and decided, the commission sent a message to Sibley renewing “their application for a commutation of the sentence of . . . Godfrey . . . .” They said his “testimony [in other cases] has been invaluable to the State, for without it a large number of men of the very worst character would have gone unpunished.” His evidence “has always proved truthful both by corroborative evidence and by the acknowledgements of the prisoners themselves.” Therefore, “his services . . . warrant the exercise of judicial clemency.”
Sibley, however, refused this unique plea for clemency and did not commute Godfrey’s sentence of death by hanging.
All of these convictions were put on hold when President Lincoln by a November 12th telegram decided that his Administration would review the military commissions’ decisions with an order to General Pope to forward the “full and complete record” of the convictions to the President.
 Bachman, Northern Slave Black Dakota: The Life and Times of Joseph Godfrey at 102-03 (2013).
 Bachman at 124-25.
 Id. at 138-39.
 Id. at 138-66.
 Id. at 180-81.
 Id. at 220-22.
 Id. at 218-19.
 Id. at 221-22.
 Id. at 239. President Lincoln’s review of the convictions will be the subject of another post. Another topic to be explored in another post will be certain legal issues raised by these trials and sentences.