The Brazilian Naval Revolts, or the Revoltas da Armada (in Portuguese), were armed mutinies promoted mainly by admirals Custódio José de Melo and Saldanha da Gama and their fleet of rebel Brazilian navy ships against the claimed unconstitutional staying in power of president Floriano Peixoto.

The navy's mutiny off Rio de Janeiro, in the Guanabara Bay, was also a challenge, and became linked to the Federalist Revolution in southern Brazil.

Two of the navy's major ships were overseas and supposedly away from the conflict: the battleship Riachuelo was under repairs in France, and the corvette Barroso was on a round-the world training voyage (during which she sank).

[citation needed] The rebels were the majority in the Navy, but faced strong opposition in the Army, where thousands of young soldiers joined the battalions that supported president Floriano Peixoto.

[citation needed] At dawn on 1 December, admiral Custódio de Melo, in the Aquidabã, followed by the República and auxiliary cruisers, went south to join forces with the federalists.

[8] On 7 December, rear admiral Luis Filipe Saldanha da Gama, then director of the Naval School, joined the movement, taking over the rebels in Rio de Janeiro, beginning the second phase of the Navy Revolt.

[citation needed] The Federalist Revolution continued in the south, where Saldanha da Gama and his men were still leading troops against the government.

On 16 April 1894, the rebel battleship Aquidabã was torpedoed in Santa Catarina by the torpedo-boat destroyer Gustavo Sampaio, which was commanded by lieutenant Altino Flávio de Miranda Correia.

[11] In the República cruiser, Custódio de Melo, commanding four merchant ships and two thousand men, unsuccessfully tried to land in the city of Rio Grande.

[12] According to historian Helio Silva, the end of the third and final phase of the Armada Revolt happened with the death of Saldanha da Gama, on 25 June 1895, in the Battle of Campo Osório, in Rio Grande do Sul.