1st Regiment of New York Volunteers, for service in California and during the war with Mexico was raised in 1846 during the Mexican American War by Jonathan D. Stevenson. Accepted by the U. S. Army on August 1846 it was transported around Cape Horn to California where it served as garrisons in Montery, Santa Barbara, Los Angeles and San Diego. Elements of the Volunteers under Lt Colonel Henry Stanton Burton were involved in operations of the Pacific Coast Campaign in Baja California, captured and garrisoned towns there, fighting in the Battle of La Paz, Siege of La Paz and defeated local forces at the Battle of Todos Santos after the peace was negotiated in 1848. The Regiment was then evacuated from Baja California and disbanded in California on August, September and October 1848. ^{[1] [2]}

• Colonel Jonathan D. Stevenson
• Lt. Colonel Henry S. Burton, (1st Lt. U.S. 3rd Artillery Regiment)
• Major James A. Hardie (2nd Lt., U.S. 3rd Artillery Regiment

• Surgeon, Alexander Perry.
• Asst. Surgeon, Robert Murray.
• Asst. Surgeon, William C. Parker.
• Captain William G. Marcy, Commissary.
• Adjutants
  • First Lieutenant Henry C. Matsell. (Relinquished staff position to command his Company B, March 1847.)
  • First Lieutenant John C. Bonnycastle, (From March 22, 1847; appointed to U.S. 4th Infantry Regiment June 1848.)
  • Captain Joseph L. Folsom, Asst. Quartermaster.

• Sergeant-Major, Alexander C. McDonald.
• Quarter-master Sergeant, Stephen Harris.
• Quarter-master Sergeant, George G. Belt.
• Quarter-master Sergeant, James C. Low.

• Sutler, Samuel W. Haight.
• Clerk, James C. L. Wadsworth.

• Captain, Seymour G. Steele.
• First Lieutenant, George S. Penrose. Acting commissary and quartermaster.
• Second Lieutenant, Charles Benjamin Young
• Second Lieutenant, George Francis Lemon, (Post Adjutant)
• Sergeant, Sherman O. Houghton.
• Sergeant, Walter Chipman.
• Sergeant, Edward Irwin.

• Captain, James M. Turner (did not go to California)
• First Lieutenant, Henry C. Matsell, (Former Adjutant, commanded Company B from March 1847.
• Second Lieutenant, Thomas E. Ketchum.
• Second Lieutenant, E. Gould Buffum.
• Sergeant, James Stayton.
• Sergeant, Charles C. Scott.
• Sergeant, John Wilt.
• Sergeant, Charles Richardson.
• Sergeant, James D. Denniston.

• Captain, John E. Brackett (former 2nd Lt. U.S. 2nd Artillery Regiment)
• First Lieutenant, William R. Tremells, (Acting adjutant — died at sea off Cape Horn.)
• First Lieutenant, Thomas J. Roach.
• Second Lieutenant, Theron R. Perlee.
• Second Lieutenant, Charles C. Anderson, (died at San Francisco September 13, 1847).
• Second Lieutenant, George D. Brewerton, (Appointed to U.S. 1st Infantry Regiment.
• Sergeant, Edmund P. Crosby.
• Sergeant, William Johnson.
• Sergeant, George Robinson.

• Captain, Henry M. Naglee (former 2nd Lt. U.S. 5th Infantry Regiment)
• First Lieutenant, George A. Pendleton.
• Second Lieutenant, Hiram W. Theall.
• Second Lieutenant, Joseph C. Morehead.
• Sergeant, Aaron Lyons.
• Sergeant, William Roach.
• Sergeant, Henry J. Wilson.

• Captain, Nelson Taylor.
• First Lieutenant, Edwards Williams.
• Second Lieutenant, William E. Cuttrell.
• Second Lieutenant, Thomas L. Vermeule.
• Sergeant, John M. O’Neil.
• Sergeant, Henry S. Morton.
• Sergeant, James Maneis.
• Sergeant, Abraham Van Riper.

• Captain, Francis J. Lippitt.
• First Lieutenant, Henry Storrow Carnes.
• Second Lieutenant, William H. Weirick.
• Second Lieutenant, John M. Huddart.
• Sergeant, James Queen.
• Sergeant, Thomas Hipwood.
• Sergeant, James Mulvey.
• Sergeant, John C. Pulis.

• Captain, Matthew R. Stevenson (2nd Lt. U.S. 7th Infantry Regiment)
• Second Lieutenant, John McHenry Hollingsworth. (May 1847)
• Second Lieutenant, Jeremiah Sherwood.
• Second Lieutenant, William H. Smith.
• Sergeant, Walter Taylor.
• Sergeant, William B. Travers.
• Sergeant, James Mehan.
• Sergeant, John Connell.
• Sergeant, George Jackson.

• Captain, John B. Frisbie.
• First Lieutenant, Edward Gilbert, (Acting adjutant)
• Second Lieutenant, John S. Day.
• Sergeant, Eleazer Frisbie.
• Sergeant, William Grow.
• Sergeant, Henry A. Schoolcraft.
• Sergeant, James Winne.

• Captain, William E. Shannon.
• First Lieutenant, Henry Magee.
• Second Lieutenant, Palmer B. Hewlett.
• Sergeant, Joseph Evans.
• Sergeant, Joshua S. Vincent.
• Sergeant, B. Logan.

• Captain, Kimball H. Dimmick.
• First Lieutenant, George C. Hubbard.
• Second Lieutenant, John S. Norris.
• Second Lieutenant, Roderick M. Morrison.
• Sergeant, Jackson Sellers.

• List of U. S. Army, Navy and Volunteer units in the Mexican American War

• THE WORKS HUBERT HOWE BANCROFT, VOLUME XXII. HISTORY OF CALIFORNIA, Vol. V. 1846-1848, THE HISTORY COMPANY SAN FRANCISCO, 1886. pp. 499-518