Order of battle at Chorrillos

This is the order of battle for the Battle of San Juan and Chorrillos in 1881 during the War of the Pacific.

Chilean Operations Army
Commander in Chief of the Chilean Army: GLD Manuel Baquedano González (37)

Total strength: 23,179 men
 * Chief of Staff: GLB Marcos Maturana (48)
 * General Inspector of the Army: GLB Cornelio Saavedra Rodríguez (6)
 * Commander of Artillery: Col. Jose Velasquez Borquez (6)
 * Commander of Cavalry: Lt. Col. Emeterio Letelier (6)
 * Sanitary Service Superintendent: Dr. Ramón Allende Padín (241)
 * 1° Ambulance
 * 2° Ambulance
 * 3° Ambulance
 * Logistic and Transport Services: Col. Francisco Bascuñán (140)

I Division
Commodore Patricio Lynch Solo de Zaldívar, Chilean Navy (6)

Chief of Staff: Col. Gregorio Urrutia, Chilean Army (15)

Strength: 9.295 men
 * 1st Infantry Brigade Col. Juan Martinez (3)
 * 2nd Line Infantry Regiment (Lt. Col. Estanislao del Canto) (980)
 * Atacama Infantry Regiment (Col. Juan Martinez) (1.174)
 * Colchagua Infantry Regiment (Lt. Col. Manuel Soffia) (854)
 * Talca Infantry Regiment (Lt. Col. Silvertre Urizar) (1.184)
 * Marine Artillery Regiment (Lt. Col. Vidaurre) (360)
 * Melipilla Infantry Battalion (Lt. Col. Vicente Balmaceda) (451)
 * 2nd Infantry Brigade Col. Jose Domingo Amunategui
 * 4th Line Infantry Regiment (Col. Luis Solo de Zaldivar)
 * "Chacabuco" Infantry Regiment (Col. Domingo de Toro Herrera)
 * Coquimbo Infantry Regiment (Lt. Col. Jose Maria 2º Soto)

II Division
Col. Emilio Sotomayor Baeza

Strength: 5,970 men
 * 1st Brigade Col. Jose Francisco Gana
 * "Buin" 1st Line Infantry Regiment (Lt. Col. Juan Leon Garcia)
 * "Esmeralda" Infantry Regiment (Lt Col. Adolfo Holley)
 * Chillán Infantry Regiment (Lt. Col. Pedro Guiñez)
 * 2nd Brigade Col. Orozimbo Barbosa
 * Lautaro Infantry Regiment (Lt. Col. Eulogio Robles)
 * Curicó Infantry Battalion
 * Victoria Infantry Battalion

III Division
Col. Pedro Lagos

Strength: 
 * 1st Brigade Col. Martiniano Urriola
 * Aconcagua Infantry Regiment
 * Navales Infantry Battalion
 * 2nd Brigade Col. Francisco Barceló
 * Concepción Infantry Regiment
 * "Santiago" Infantry Regiment (Col. Demófilo Fuenzalida)
 * Bulnes Infantry Battalion
 * Valdivia Infantry Battalion
 * Caupolican Infantry Battalion (Col. José M. del Canto)

Reserve
Col. Aristides Martínez

Strength: 
 * 3rd Line Infantry Regiment (Col. Ricardo Castro)
 * Valparaíso Infantry Regiment (Lt. Col. Marchant)
 * Zapadores Infantry Regiment (Lt. Col. Zilleruelo)

Peruvian Army
Supreme Commander in Chief: President Nicolás de Piérola
 * Chief of the General Staff: Gen. Pedro Silva

North Army
Gen. Ramón Vargas Machuca

I Army Corps
Col. Manuel Iglesias
 * 1st North Division Col. Mariano Noriega
 * 1st Peruvian Guards Infantry Battalion
 * Cajamarca No.3 Infantry Battalion
 * Ayacucho "9th December" 5th Infantry Battalion
 * 2nd North Division Col. Manuel Regino Cano
 * Tarma No.7 Infantry Battalion
 * 9th Infantry Battalion Callao
 * Libres de Trujillo No.11 Infantry Battalion
 * 3rd North Division Col. Pablo Arguedas
 * 13th Infantry Battalion "Junin"
 * 15th Infantry Battalion Ica
 * Libres de Cajamarca No.21 Infantry Battalion

II Army Corps
Col. Belisario Suarez
 * 4th North Division Col. Buenaventura Aguirre
 * Huanuco No.17 Infantry Battalion
 * Paucarpata No.19 Infantry Battalion
 * Jauja No.23 Infantry Battalion
 * 5th North Division Col. Benigno Cano
 * Ancash No.25 Infantry Battalion
 * Concepción No.27 Infantry Battalion
 * Zepita or Zuavos No.29 Infantry Battalion

Center Army
Col. Juan Nepomuceno Vargas

III Army Corps
Col. Justo Pastor Dávila
 * 3rd Center Division Col. Cesar Canevaro
 * 67th Infantry Battalion Piura
 * 23 December No.69 Infantry Battalion
 * Libertad No.71 Infantry Battalion
 * 5th Center Division Col. Fabian Merino
 * 85th Cajamarca Ranger Battalion
 * Unión No.87 Infantry Battalion
 * 89th Junín Rifle Infantry Battalion
 * Light Division Col. Manuel C. Bustamante, Peruvian Civil Guard
 * A and C Corps, Civil Guard
 * D and E Corps, Civil Guard
 * B Corps, Civil Guard

IV Army Corps
Col. Andrés Avelino Cáceres
 * 1st Center Division Col. Domingo Oyarza
 * 61st Lima Infantry Battalion
 * Canta No.63 Infantry Battalion
 * 28 July No.65 Infantry Battalion
 * 2nd Center Division Col. Manuel Pereyra
 * Pichincha No.73 Infantry Battalion
 * Piérola No.75 Infantry Battalion
 * La Mar No.77 Infantry Battalion
 * 4th Center Division Col. Lorenzo Iglesias
 * Arica No.79 Infantry Battalion
 * Manco Cápac No.81 Infantry Battalion
 * 83rd Ayachucho Infantry Battalion