First years in the Old Republic Firmino helped Deodoro da Fonseca to overthrow Emperor Pedro II Hering the
Proclamation of the Republic on 15 November 1889 and was promoted to colonel in 1890. In September 1893, he commanded the 6th Brigade to defend Floriano Peixoto government during the
Revolta da Armada. In 1894, he was elected as Senator. He was reelected 9 times, serving up until 1920, and was part of the Commissions of the Navy, War and Constitution and Justice. In 1895, he was promoted to
Brigadier general. Firmino was also a First Class Instructor in the
Military School of Realengo from Rio de Janeiro and
Rio Grande do Sul and Inspector of the Military Schools of Rio de Janeiro and Rio Grande do Sul. In 1892, Coriolano de Carvalho e Silva, Governor of Piauí, fought with Baron of Castelo Branco, as the later denied an alliance to exclude Simplício Coelho de Resende from politics. The situation worsened when Resende was arrested in 1895 in the Gabino Besouro Government for publishing a note in his journal,
O Democrata, for the hiring of a sentenced criminal as cooker for the Government Palace. In 1896, Firmino and other powerful politicians that felt excluded formed a colligation against Raimundo Arthur de Vasconcelos, Governor of Piauí and political inheritor from Coriolano de Carvalho. The colligation was supported by the president
Prudente de Morais and used
O Democrata to attack the Governor. Raimundo, then, closed himself in an inner circle for the elections of 1896 and tried to renovate his allies as senators and congressmen. One of the candidates for the Senate in the Raimundo colligation was Joaquim de Lima Pires Ferreira, brother of Raimundo. Firmino group allied with the
Federal Republican Party (PRF) and the Republican Legalist Party (PRL), but the elections were deemed fraudulent by both sides. Pachequismo lasted for two governments, from João Luís Ferreira and Matias Olímpio de Melo. Melo's government was marked by a raise in violence in the state, as he had to fight
cangaceiros and the
Coluna Prestes. In 1927, the federal judge Lucrécio Dantas Avelino was murdered in his own house, and the opposition accused Melo to be the responsible, and Melo accused Eurípedes of the crime. Fernando used the instability of pachequismo and the support of the president
Washington Luís, as his grandchild, Firmino Pires de Mello, was married to the presidents daughter, to be elected as a Senator. Félix won the election, but Fernando contested on STF and was elected instead, with Félix becoming ineligible. The structure of power change once again, and Melo was obligated to colligate with Fernando, that supported João de Deus Pires Leal as governor. When João won the elections, his government began to substitute political opponents from the public machine. João de Deus also interfered directly in the elections, when he supported the election of José Pires Ferreira Neto to the
Legislative Assembly of Piauí. ==Death==