Columna Durruti
This was the first military initiative, developed on July 24, 1936, when the first voluntary militia, the Durruti Column, departed from Barcelona in the direction of Zaragoza. One of the last columns was the Los Aguiluchos Column, which left Barcelona on August 28 in the direction of Huesca. The columns of Barcelona and Lleida headed mainly towards Huesca and Zaragoza, and the Valencian ones towards Teruel, repeatedly besieging the three provincial capitals. At the beginning of September the Carod-Ferrer Column arrived and was installed around Villanueva de Huerva.