18 of the Copacabana Fort revolt.
Occurred on July 5, 1922, in the city of Rio de Janeiro. It was the first revolt of the tenentista movement, in the context of popular discontent on the Brazilian Old Republic.
The Tenentismo was a political-military movement of various rebellions by young officers (mostly lieutenants) of the Brazilian army that occurred during the 1920’s, heavily influenced by the October Revolution in Russia and Brazil’s participation in The Great War. The tenentes called for reforms in the power structure.
Although they failed to achieve their goals, the rebels were able to establish an important milestone in the struggle against the domination of the oligarchies. This revolt inspired other movements tenentistas in the country like, for example, The Prestes Column and The Paulista Revolt of 1924. Making this revolt the beginning of the fall of the Brazilian Old Republic.