What conflict brought the countries of Chile and Argentina to the brink of War, where the first planned military invasion was halted without incident?
Operation Soberanía Operación Soberanía (Operation Sovereignty) was a planned Argentine military invasion of Chile started on 22 December 1978 due to the Beagle conflict dispute. The invasion was halted after a few hours and Argentine forces retreated from the conflict zone without a fight. Whether the Argentine infantry actually crossed the border into Chile has not been established. Argentine sources insist that they crossed the border.
Seguro Obrero massacre The Seguro Obrero massacre (Spanish: "Matanza del Seguro Obrero" , literally in English: Workers Insurance's Massacre) occurred on September 5, 1938, and was the Chilean government's response to an attempted coup d'état by the National Socialist Movement of Chile (MNSCh), whose members were known at the time as "Nacistas". After a failed coup involving a stand-off and a shootout, about 60 Nacistas who had surrendered after being given assurances, were in fact summarily shot.