Field-Marshall  José Antonio Correia da Camara (Viscount of Pelotas) - As major of the Imperial Army Camara took part in the campaing of Uruguay during the last month of 1864 and January of 1865 ahead the 1st Fusiliers Battalion. Promoted to lieutenat-colonel and then colonel in 1867, he was appointed as chief of staff of a division under general João Mena Barreto. Under command of Count D'Eu in the last phase of the war, Camara took part in the persecution of Lopez vanquished forces until the last blow at Cerro-Cora. After the war he retired from service.
Vice-Admiral  Joaquim Marquês Lisboa (Marquis of Tamandaré), Commander-in-Chief of Allied Naval Forces - Tamandaré served during the campaigns for Independence in 1823 and in the southeners conflicts against Argentina and Uruguay (1825-1828) ans Rosas (1852). As vice-admiral he conducted the Imperial Fleet in the siege of Montevideo and in the bombardment of Payssandu in December 1864 and January 1865 in support of Colorado and Brazilian landing forces. When the Triple Alliance War erupted he was immediately appointed as commander-in-chief of all naval forces under the three allied countries. In 1867 he was promoted to admiral. The fail at Curupaity the previous year, however, costed him active service.
Marshall of the  Army Luis Alves de Lima e Silva (Duke of Caxias), Commander-in-chief of Brazilian forces on Paraguay since October, 1866 until March , 1869 - Caxias is a unique case in the world of a man who has served at a fighting force for a so long period of time. In 1808, at the age of five, he was admitted as private at the First Infantry Regiment at the Court of Rio de Janeiro were he was born. In 1821 he was promoted to lieutenant at a elite force of King D. João VI (grandfather of Brazilian Emperor D. Pedro II). When Brazil became independent in 1822 Caxias took part in the fights to expel the remainders of the Portuguese Army
from the Brazilian soil. He was also appointed to the struggles in the south in 1851-52. As politician, Caxias took seat as senator, member of the gabinet and of the State Council while member of the Conservative Party. Despite his well-conduct on the repression of the revolts within the country from 1822 to 1842 and in the south against Argentinean and Uruguayan forces, he was put aside when the Triple Alliance War began. The Liberal Party, at power when Solano Lopez started moving his forces, never forgot that Caxias was a member of the opposite party and would never put him ahead of the army to challenge Lopez. Nevertheless, after the fail at Curupaity, the emperor himself gave Caxias the command of all Brazilian forces, including the navy.  By this time, Brazilian Army and Navy represented more than 80% of Allied troops. Caxias conduct at war was fair different from Mitre's and even Osório's. He adopted at Paraguay a slow but continuous movement to encircle the enemy while the Allies armies grew in force thanks to the arrival of new units. Once he had a significant advantage  in men and material at a certain point of the front line, he would launch a quickly and concentrated attack.   After the fall of Asuncion in January, 1869 he resigned from command and retired from active service. Caxias died some years later in 1880.
Antonio Paranhos (Viscount of Porto Alegre) - Porto Alegre was born in the province of Bahia (northeast of Brazil). He fought in Ituzaingo (Passo do  Rosário) and commanded the Imperial Army in Caseros (1852).  He was one of the first officers to cross Paraná River into Paraguay in March, 1866. During the war he commanded the II Corps of the Imperial Army. When Lopez forces attacked at Tuyuty on May 24, 1866 Porto Alegre corps was far from battlefield in a mission to seek  a passage  that would enable the Allied Army to avoid
the cross of swamps and muddy terrains around Tuyuty. Nevertheless, at Curuzu and Curupaity he conduct his troops bravely and the II Corps suffered a great toll of casualties on those battles. On the second Battle of Tuyuty (fought on May 8, 1868) the II Corps had to detain a desperate Paraguayan onslaught which almost broke the allied lines. Port Alegre was wounded several times over the din of battle while commanding his troops. He retired from battlefield then.
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Field-Marshall Polidoro da Fonseca Quintanilha Jordão (Viscount of Santa Teresa) - Commander of the I Corps of the Imperial Army from July, 1866 (when Osório was substituted in command) until May, 1867. He assumed command of the II Corps when Count D'Eu was appointed commander-in-chief of the Imperial forces in the last phase of the war. By January, 1870 he retired from active service due to his lack of good health.