The Rio de Janeiro Affair refers to a series of incidents during the Brazilian Naval Revolt in January 1894. Following three attacks on American merchant ships in the harbour of Rio de Janeiro, a bloodless naval engagement occurred between a United States Navy warship and an ironclad of Rear Admiral Saldanha da Gama's rebel fleet. Ultimately the Americans completed their objective, and Gama offered to surrender his fleet to the Americans, but the offer was never pursued.
Cruiser Detroit in the Guanabara Bay, during the Brazilian Naval Revolt (L'Univers illustré, Levy (Paris), nº 2.029, 10 February 1894).