The following units and commanders of the Brazilian and Paraguayan armies fought in the Battle of Ytororó on December 6, 1866.
Brazilian Imperial Army
Marshal of the Army Luís Alves de Lima e Silva, Duke of Caxias
I Corps General Jacinto Machado Bittencourt
DivisionBrigade Regiments and Others5th Division
Colonel Betbeze Olivera 4th Brigade
Colonel Faria Rocha 25th Corpos de Voluntários 29th Corpos de Voluntários 33rd Corpos de Voluntários 9th Brigade
Colonel Lourenço de Araújo 41st Corpos de Voluntários 42nd Corpos de Voluntários 46th Corpos de Voluntários 51st Corpos de Voluntários 10th Brigade
Colonel Luis de Albuquerque Maranchao 23rd Corpos de Voluntários 47th Corpos de Voluntários 50th Corpos de Voluntários
II Corps
General Alexandre Gomes de Argolo Ferrão Filho
DivisionBrigade Regiments and Others1st Division
General Antunes Gurjão 1st Brigade
Colonel Miranda Reis 4th Line Battalion 12th Line Battalion 16th Line Battalion 8th Brigade
Colonel Hermes Ernesto da Fonseca 8th Line Battalion 10th Line Battalion 32nd Corpos de Voluntários 38th Corpos de Voluntários 13th Brigade
Colonel Barros de Vasconcelos 24th Corpos de Voluntários 28th Corpos de Voluntários 51st Corpos de Voluntários2nd Division
General Salustiano Jerônimo dos Reis 2nd Brigade
Colonel Rodrigues Seixas 2nd Line Battalion 26th Corpos de Voluntários 40th Corpos de Voluntários 5th Brigade
Colonel Fernando Machado de Sousa 1st Line Battalion 13th Line Battalion 34th Corpos de Voluntários 48th Corpos de VoluntáriosOther Cavalry
Colonel João Niederauer Sobrinho 6th Provisional Cavalry Corps 9th Provisional Cavalry Corps 13th Provisional Cavalry Corps 7th Provisional Cavalry Corps, one squadron 20th Provisional Cavalry Corps, one squadron Artillery
Colonel Lobo d'Eça 2nd Provisional Horse Artillery Regiment
III Corps
General Manuel Luís Osório
DivisionBrigade Regiments and Others3rd Division
General José Auto da Silva Guimarães 3rd Brigade
Colonel Pereira Carvalho 3rd Line Battalion 9th Line Battalion 14th Line Battalion 35th Corpos de Voluntários 7th Brigade
Colonel Frederico de Mesquita 5th Line Battalion 39th Corpos de Voluntários 31st Corpos de Voluntários 55th Corpos de Voluntários4th Division
General Herculano da Silva Pedra 11th Brigade
Colonel Olivera Bueno 11th Line Battalion 27th Corpos de Voluntários 32nd Corpos de Voluntários 29th Corpos de Voluntários 12th Brigade
Colonel Francisco Caldas 36th Corpos de Voluntários 44th Corpos de Voluntários 49th Corpos de Voluntários
Paraguayan Army
DivisionBrigade Regiments and OthersDivision
General Bernardino Caballero Cavalry
General Bernardino Caballero 6th Cavalry Regiment 9th Cavalry Regiment 12th Cavalry Regiment 19th Cavalry Regiment 30th Cavalry Regiment Infantry
Colonel Germán Serrano 2nd Infantry Battalion 3rd Infantry Battalion 20th Infantry Battalion 36th Infantry Battalion 37th Infantry Battalion 40th Infantry Battalion
Sources Warner, William. "Paraguayan Thermopylae: The Battle of Itororo", in Strategy & Tactics, issue 271 (November/December 2011).