Operation Thirty Hours
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. However, the Broad Front was defeated at the polls and the plan was cancelled.

References

1971 in Uruguay
Military dictatorship in Brazil
History of South America
History of Uruguay