Richd. C. Drum to Columbus Sims, December 28, 1861

Col. COLUMBUS SIMS, E cond Cavalry California Vols., Comdg. Camp Alert, Cal. : SIR? One of the three companies of your regiment designated for service in the southern district will, the general commanding the department directs, embark on the steamer Senator for San Pedro on the 1st proximo. Lieut. Col. George S. Evans will accompany this part of his command. The quartermaster will inform you of the exact hour the troops will embark; also when transportation is in readiness for the other companies. The general directs that any officers or enlisted men in arrest or confinement belonging to these companies will be sent with their respective companies.

Very respectfully, your obedient servant,