In 1863, Rufus Henry Ingram, met George Baker from San Jose, California, who had just come east to join the Confederate Army. Baker complained because the secessionists in California had no experienced leaders. Ingram claimed to have been with Quantrill's Raiders during the Lawrence Massacre and became interested in going back with Baker to recruit soldiers for the Southern cause there.
In early 1864, Rufus Henry Ingram arrived in Santa Clara County with a Confederate commission as captain and with a former undersheriff of Monterey County Tom Poole, organized about fifty local Knights of the Golden Circle and commanded them in what became known as Captain Ingram's Partisan Rangers. Finding difficulty in raising funds to purchase supplies for his unit, Ingram first planned a raid on San Jose to rob its banks and stores in the manner of Quantrill's raid on Lawrence. However a quarrel within the band led to the exposure of the plan to the local Sheriff and it was abandoned.
Next Ingram decided to rob shipments of silver from the Comstock Lode to Sacramento. On June 30, Ingram with a small detachment robbed two stagecoaches eleven miles east of Placerville of their gold and silver, leaving a letter explaining they were not bandits but carrying out a military operation to raise funds for the Confederacy. During the pursuit of his fleeing band had a gunbattle with two lawmen at the Somerset House, killing one, while Poole was wounded and left to be captured. After a two day chase the Placerville posse lost their trail and they managed to get to Santa Clara County a week later. Meanwhile Tom Poole gave a complete confession, the bullion was recovered and he exposed his companions identities. However they evaded the search for them in Santa Clara County.
On July 15, an attempt by Ingram to rob the New Almaden Quicksilver Mine payroll failed, ending in a shootout with the posse of Santa Clara County Sheriff John Hicks Adams a mile and a half outside San Jose on the Almaden road. One of Ingrams party was wounded, two killed against the wounding of the Sheriff and a deputy. Ingram fled California for Missouri and was never captured.
It was between 9 and 10 p.m. on the night of June 30, 1864, a few miles east of Placerville near a place called Bullion Bend. Six men leveled guns at the drivers of two Pioneer Stage Line coaches, Ned Blair and Charlie Watson, who were carrying silver bullion from the Virginia City mines.
Blair's coach was halted first. He was told to throw down the Wells Fargo & Company strong box. This wasn't on Blair's stage, the robbers found out, but they did find six bags of silver bullion while searching the stagecoach.
Watson stopped his stage, thinking Blair was having problems with his team, and was confronted by the highwaymen. They gave him the same order; The Wells Fargo & Company strongbox - and two additional bags of silver bullion were on his stage. They helped themselves to the bullion and the strong box - and then presented the drivers with a receipt for everything! It stated that the money was for "out-fitting recruits enlisted in California for the Confederate Army." The receipt was signed "R. Henry Ingrim, Captain, Commanding Company C.S.A."
The robbers (who were believed to be members of Quantrell's Raiders, a much feared band of guerrillas) rode only a short distance before they cached the bullion. Shortly thereafter, all but a few coins and a silver bar were recovered by officers of the law. Nevertheless, for many years people would ignore that fact and search the area, hoping to find the "hidden bullion."
Source
I'm going with Rufus Henry Ingram with a Confederate commission as captain and George Baker (as the accomplice) since Tom Poole was captured.