=Company B at San Diego.=--On the 15th of February Company B was ordered to be detached from the Battalion and directed to march to the port of San Diego to perform garrison duty at that place, though the order, apparently, for the removal of the company was not given until the 15th of March. =Los Angeles Garrisoned by Companies A. C. D. E.=--On the 18th of the same month nine privates of Company A., eight from C., five from D., and eight from E., were designated as a detachment, under command of Lieutenant Oman and Sergeant Brown, to garrison the Mission of San Luis Rey, while the remainder of companies A. C. D. and E. were designated to go to Los Angeles for garrison duty. These companies began their march on the 19th, and arrived at Los Angeles on the 23rd. The chief activities here were maintaining by successive details from the command an out-post at Cajon Pass,--fifty miles north east of Los Angeles--as a protection against hostile bands of Indians; and the erection of a fort on an eminence commanding the city of Los Angeles. The San Luis Rey detachment remained at that post until the 6th of April, when under orders the station was abandoned and the detachment marched to Los Angeles. The companies thus grouped so remained until near the expiration of the term of their enlistment. =The Conquest of California.=--The conquest of California was easily achieved. Fremont in the north with a company of but sixty Americans, with whom he had been sent to explore portions of New Mexico and California, was opposed in the vicinity of Monterey by a force under General Castro, in June, 1846. With the aid of American settlers in the vicinity of San Francisco, Fremont defeated the Mexicans in two engagements and on the 5th of July, the American Californians declared themselves independent, and placed Fremont at the head of their affairs. On the 7th of the same month Commodore Sloat, then in the command of the U. S. squadron in the Pacific, bombarded and captured Monterey. On the 9th Commodore Montgomery took possession of San Francisco. Commodore Stockton arrived on the 15th of July and in co-operation with Colonel Fremont took possession of the city of Los Angeles, on the 17th of August. There was, however, a subsequent uprising in the south, an attempt of the Mexicans to regain possession of the country. The attempt, however, proved abortive, and was chiefly noteworthy as occurring at such a time as to allow General Kearny's troop of one hundred soldiers, who had marched from Santa Fe, to participate in some of the last engagements--December 16th, 1846, and Jan. 8th, 1847--these ended in the conquest, and brought to pass the pacification of California.