Did you know that there was a Confederate Militia in California? "They were members of a bona fide company of California Militia - the Los Angeles Mounted Rifles. As the only Free State militia unit that 'went Confederate,' their story is unique in itself." Maybe your ancestor was one of the 64 privates listed on the initial muster roll?
Assigned to: First Brigade
Location: Los Angeles, Los Angeles County
Organized: March 7, 1861
Mustered Out: 1861
Learn more at this wonderful site, California's Confederate Militia, hosted by the California State Military Museum. A link to the initial muster roll can also be found here.