d of the opening
of hostilities on the Rio Grande, the Commodore--then at
Mazatlan--hastened with the Savannah to Monterey in California, where he
arrived on July 2d, and on the 7th he took possession of the town
without opposition; the custom-house was seized, the American flag
raised, and California declared to be "henceforward a part of the United
States."

Within a few days intelligence of the action of Commodore Sloat was
received by the revolutionary leaders at Sonoma; and a battalion of
mounted riflemen which had been organized among them was immediately
moved to Monterey, the flag of the United States was substituted for the
"bear and star," and the authority of the Commodore was immediately
recognized. This battalion of mounted riflemen on its arrival at
Monterey, July 23, 1846, was mustered into the service of the United
States by Commodore Stockton, who had succeeded Commodore Sloat in
command of the squadron--Captain Fremont being appointed its commandant,
and Lieutenant A. H. Gillespie, of the Marines, its second officer--and
it was immediately despatched on the sloop-of-war Cyane to San Diego for
the purpose of cutting off the retreat of General Castro, of the Mexican
service, who had encamped and fortified his position near Ciudad de los
Angeles, while the Commodore with his sailors--who landed from the
Congress at San Pedro--moved against him in front. The expedition was
eminently successful, as the Mexicans on the approach of the Commodore
immediately evacuated their camp and fled in the greatest
confusion--although most of the principal officers were subsequently
captured--and, on August 13th, the Ciudad de los Angeles was occupied,
again without opposition, by the American troops and seamen, and the
conquest of California was apparently completed.

A short time afterward Commodore Stockton appointed Captain Fremont
Governor of the Territory into which, by the proclamation of Commodore
Sloat, the Province had been transformed; while Captain Gillespie was
left, with nineteen men, in possession of Los Angeles; Lieutenant
Talbot, of the Topographical Engineers, with nine men, was left at Santa
Barbara; and, with his squadron, Commodore Stockton proceeded to San
Francisco; while Governor Fremont, on September 8th, also moved to
Monterey.

The main body had no sooner left Los Angeles than the Californians--who
before the departure of the Commodore and the Governor had held secret
meetings for the purpos