John C. Frémont is court-martialed for mutiny and disobeying orders.

Major-General John Charles Frémont was a United States Army officer, explorer, and politician. He was a United States senator from California and was the first Republican nominee for president of the U.S. in 1856 and founder of the California Republican Party when he was nominated. He lost the election to Democrat James Buchanan when the vote was split by the Know Nothings.

A court-martial is a military court or a trial conducted in such a court. A court-martial is empowered to determine the guilt of members of the armed forces subject to military law, and, if the defendant is found guilty, to decide upon punishment. In addition, courts-martial may be used to try prisoners of war for war crimes. The Geneva Conventions require that POWs who are on trial for war crimes be subject to the same procedures as would be the holding military's own forces. Finally, courts-martial can be convened for other purposes, such as dealing with violations of martial law, and can involve civilian defendants.