This regiment was organized under the President's second call upon the State for troops….The call was dated Washington, August 14, 1861, and by October 30, 1861, the regiment was organized and mustered into the service.

The companies were first assembled at Camp Alert, San Francisco, which was located on the ground now enclosed by Mission, Folsom, Twenty-fourth, and Twenty-sixth Streets, then known as the Pioneer Race Track.

After completing the organization of the regiment, and a short period for drill and discipline, the regiment was sent, by companies, to various stations.
Company "F"--Ordered from San Francisco to Camp Union,