Operation Thirty Hours (Portuguese: Operação Trinta Horas) was a Brazilian military plan to invade Uruguay in 1971.
Brazil was under a military dictatorship, governed by Emílio Garrastazu Médici.
During that time Uruguay was in an electoral process and the possibility of victory by the left-wing Frente Amplio (Broad Front) frightened both the Brazilian rulers and the Tupamaros, an Uruguayan urban guerrilla group.
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