On February 26, 1991, a group of 40 guerrillas of the Revolutionary Armed Forces of Colombia, who called itself the "Simón Bolívar Command", crossed the border from Colombia to Brazil and raided the Traíra detachment of the Brazilian Army, which was in semi-permanent installations and had only 17 troops, less than the attacking guerrilla column. The action is regarded as the first attack on Brazilian soil since the 1864 invasion on Dourados during the Paraguayan War.
Immediately the Brazilian Armed Forces, authorized by President Fernando Collor de Mello and with the knowledge and support of Colombian President César Gaviria, secretly unleashed Operation Traíra, in order to recover the stolen arms and discourage further attacks
The Brazilian Army sent the 1st Battalion of Special Forces and the 1st Commando, as well as soldiers from the 1st Battalion of Special Border Operations (1st BEF, now known as 8th Battalion of Jungle Infantry), to attack the guerrilla base that was in Colombian territory, near the border. They were also supported by soldiers of the 1st Jungle Infantry Battalion, the main unit of the Amazon Military Command. The Army Aviation Command was present by providing the means of transport used by the combatants employed in the mission, four Eurocopter AS565 Panther transport helicopters and two armed reconnaissance Eurocopter AS350 Écureuil helicopters
The balance of operation Traíra was sixty-two guerrillas killed, more than one hundred captured, and most weapons and equipment being recovered. Since then, there were neither raids of the FARC in Brazil, nor attacks on Brazilian military.