At the time Silo gave this speech in 1969, the military dictatorship then in power in Argentina had banned all public gatherings in urban areas. Consequently, a bleak spot known as Punta de Vacas, high in the Andes on the border between Argentina and Chile, was chosen as the location for the speech. Early in the morning of May 4, the authorities placed roadblocks on all roads leading to the site. Machine-gun posts, military vehicles, and armed soldiers were stationed along the roads, and everyone was required to show identification papers to pass through the checkpoints, which led to disputes with some members of the international press.

Against the magnificent backdrop of the snow-capped Andes, Silo began to speak to an audience of some two hundred people. The day was cold and bright, and by noon the event was over.

(for full text of Silo's speech see right hand side panel).