Guerrilla de San Martín Historical milestone · Garganta la Olla, La Vera, Cáceres Image of Garganta la Olla, not of the place itself. In 1492 Garganta la Olla took part in an armed clash with Plasencia known as the 'Guerrilla de San Martín,' commemorated today in the Lunes de Piedra pilgrimage to the chapel of San Martín. 1492 Photo: PMRMaeyaert (CC BY-SA 4.0) What to see and do in Garganta la Olla