John C. Frémont court-martialed; verdict set aside by President Polk

Background. Frémont served as a major in the U.S. Army during the Mexican-American War, taking control of northern California in 1846. He accepted the Treaty of Cahuenga in January 1847, ending hostilities in upper California. Following this, Commodore Stockton appointed him military governor, a position that led to conflicts with General Kearny and subsequent legal proceedings.

Court-Martial Proceedings. Ordered by Kearny to report to Washington, Frémont faced a court-martial. He was found innocent of mutiny but convicted on January 31, 1848, for disobedience toward a superior officer and military misconduct. This legal outcome prompted Frémont to seek restoration of his honor and explorer reputation, leading to his eventual retirement from active military service.

Presidential Intervention. James K. Polk served as the 11th president of the United States from 1845 to 1849, overlapping the period of Frémont's court-martial. In December 1848, Polk sought to establish territorial governments in California and New Mexico, a task made urgent by the onset of the California Gold Rush. The supplied passages do not state that Polk set aside Frémont's verdict, so that legacy claim remains unsupported here.

Retirement to California. After the court-martial, Frémont moved to Las Mariposas in California to become a rancher. He borrowed money from his father-in-law Benton and Senator John Dix to construct a house, corral, and barn. The discovery of gold on his property made him instantly wealthy, allowing him to live a wealthy lifestyle in Monterey.