
The Expulsion of the French from Rio de Janeiro. Painting by Armando Martins Viana, 1940. National Historical Museum, Rio de Janeiro.
On March 17, 1560, a Portuguese military contingent led by the then Governor-General of Brazil, Mem de Sá, attacked and destroyed "Fort Coligny." Located on what is now Villegagnon Island (then known as Serijipe Island) in Rio de Janeiro, the fortification had been built by a group of French colonists led by Nicolas Durand de Villegagnon. They had named the region "France Antarctique" (1555–1560) in an attempt to establish a French colony in Brazil.
Alerted to the French presence in Rio de Janeiro, the Portuguese assembled a fleet of 26 warships to retake Guanabara Bay.
The Portuguese account of the confrontation comes from the writings of José de Anchieta, who was part of Mem de Sá's expedition. With a force of 120 Portuguese soldiers and the support of 140 Indian allies (Tupinambá and Temiminó) armed with arrows and traveling in canoes, they surrounded the island—where approximately 75 Frenchmen were entrenched, supported by about a thousand Tamoio warriors. They called upon the French colonists to surrender, but the latter refused. After a prolonged siege, a Portuguese sailor swam to the island and blew up the gunpowder magazine, forcing the French to abandon the fight and flee; most returned to France, while about 20 escaped to the mainland, taking refuge among allied indigenous settlements. The fortification thus captured (March 16) was razed, as Mem de Sá—hampered by damaged ships and a shortage of men—lacked the resources to establish a permanent settlement in Guanabara Bay; he returned to Salvador on April 3.
Despite being driven out of the city, the French did not abandon their efforts to conquer the site where Rio was founded. The two years following the Portuguese conquest were marked by intense attacks from the enemy. To assist the Captain-Major in maintaining control over the former France Antarctique region, a fleet from the Northeast, commanded by Cristóvão de Barros, arrived in Rio on January 20, 1567. This reinforcement proved crucial to the victories in the battles of Uruçumirim and Paranapuã Island, which were taking place at the time.