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| El Tacnazo | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Part of the Cold War | |||||||||
 Regimiento Tacna building in Santiago de Chile. | |||||||||
| |||||||||
| Government-Insurgents | |||||||||
| Eduardo Frei Montalva | Roberto Viaux | ||||||||
| Political support | |||||||||
| All parties in Congress of Chile | |||||||||
| Military support | |||||||||
| Almost all Chilean Armed Forces | Tacna Regiment | ||||||||
Tacnazo insurrection (October 21, 1969) (Spanish: El Tacnazo) was a brief revolt of the Tacna artillery regiment, led by General Roberto Viaux, in what turned out to be a non-violent demonstration against the government of Chilean President Eduardo Frei Montalva.