Organized as a Battalion of 5 Companies at Camp Merchant, near Oakland, California

Mustered in as follows:

August 16: Co. “A,”
October 31: Co. “B,”
October 31: Co. “C,”
September 9: Co. “D,”
August 15, 1865: Co. “E,”

7 new Companies organized and mustered in as follows:

December 15: Co. “F,”
June 13: Co. “G,”
December 31: Co. “H,”
November 12: Co. “I,”
May 16: Co. “K,”
August 15: Co. “L,”
May 16, 1863: Co. “M,”

March, 1862: Companies “A,” “B,” “C,” “D,” “E” moved to Southern California and duty at Los Angeles (3 Cos.) and at San Bernardino (2 Cos.).
November 20-29, 1861: Pursuit and capture of Showalter’s party at Warner’s Ranch, near San Jose Valley. (Detachment).
March, 1862: Attached to Carlton’s California Column, organized for an Expedition to recapture the Forts and Posts in Arizona and New Mexico.
March 1-16: March to Stanwix Rancho, Arizona.
April 8-September 20: Carlton’s Expedition through Arizona to Northwest Texas and Indian Territory.
Led advance guard of the Column on its march across the Yuma and Colorado Deserts to the Rio Grande River.
April 8-15: March to Picacho Pass.
April 15: Action at Picacho Pass.
April 16-24: March to Pimos Villages.
April 26-29: Expedition to Kenyon Station.
May 15: Duty at Pimos Villages.
May 15-20: March to Tucson.
May 20: Occupation of Tucson.
May 24, duty until June 17: Reoccupation of Fort Breckenridge, afterwards Fort Stanford, at Junction of the Gila and San Pedro Rivers.
June 21-July 6: Moved to Tucson, thence to Fort Thorne, Arizona, on the Rio Grande River.
July 6: Reoccupation of Fort Thorne.
July 15-19: Expedition for the reoccupation of Mesilla, Fort Fillmore and Fort Bliss.
August 16: At Las Cruces.
August 16-22: Expedition to Fort Bliss and Fort Quitman.
October: At Camp Johnson, Texas.
September 21: Affair at San Pedro Crossing, Arizona. (Detachment).
January, 1863: At Mesilla, Arizona.
November 15-December 31, 1862: Expedition against Apache Indians.
November 15: White Mountains.
September, 1863: At Fort West, Dept. of New Mexico.
March 27: Skirmish at Bonito Rio, N. Mex.(Cos. “A,” “B” and “L”).
April 25: Skirmish near Fort Bowie, Arizona. (Detachment).
August 20-December 16, 1863: Operations against Navajo Indians in New Mexico.
Arizona.
August 22: Skirmish at San Pedro Crossing.
August 27: Fort Bowie, Arizona. (Co. “E”).
December, 1863: Duty at Las Cruces, N. Mex.
September, 1866: Companies scattered at various points and Posts in Districts of Arizona and California and Depts. of New Mexico and the Pacific.
January 28, 1864: Skirmish at Oregon Mountains, Ore. (Co. “D”).
May 4: Skirmish at Foot of Sierra Bonito, N. Mex. (Co. “C”). Doubtful Canon, N. Mex. (Co. “I”).
May 15: Spencer’s Ranch, near Presidio del Norte, N. Mex. (Co. “A”).
May 16-August 2: Expedition from Fort Craig, N. Mex., to Fort Goodwin, Arizona.
May 25-July 13: Expedition to Gila River. (Cos. “C,” “F” and “L”).
July 6-24: Scout in Southeast Arizona. (Co. “C”).
July 14: Croton Springs, Arizona. (Co. “L”).
July 18-August 17: Expedition to Pinal Mountains, Arizona. (Co. “E”).
July, 1864, to November, 1865, at Fort McDowell until April, 1866: Company “I” at Fort Goodwin, Arizona.
July 23-October 10, 1864: Expedition to Southwest New Mexico. (Co. “C”).
October 1-November 27, 1864: Expedition from Fort Craig to Fort Goodwin, Arizona.
November 25, 1864: St. Vrain’s Old Fort, Canadian River. (Cos. “B,” “K” and “M”).
February 17, 1865: Fort Buchanan, Arizona.
May 10-19, 1865: Scout from Fort Sumner.
June 13-17, 1865: Scout from Camp Nichols. (Co. “F”).
June 14: Skirmish, Santa Fe Road, N. Mex. (Co. “F”).
June 15-22: Scout from Fort Sumner to Oscura Mountains. (Detachment).
June 26-July 6: Scout from Fort Bowie to Gila River, Arizona. (Cos. “F,” “L” and “M”).
July 1: Sacramento Mountains, N. Mex. (Cos. “G” and “H”).
July 3: Cottonwood Creek (Cos. “F,” “L” and “M”).
July 4: Cavalry Canon (Cos. “F,” “L” and “M”).
July 10-21: Expedition from Fort Bowie to Maricopa Wells (Detachment).
September 4, 1865: La Monica Springs, N. Mex. (Cos. “G” and “H”).
October, 1863, to January, 1864: Company “L” stationed at Camp Union, Cali.
February and March, 1864: Drum Barracks, Cali.
April and May, 1864: Riventon, Arizona.
June, 1865: Tubac, Arizona.
February, 1866: Fort Bowie, Arizona.
February, 1866: Fort McDowell.
March 6 to October 19, 1866: Regiment mustered out.