The Nationalist coup failed to gain control of either Madrid or other urban areas, though most of the armed forces supported it. As the situation devolved into civil war, Sanjurjo was killed in an air crash on 20 July. Mola then became Nationalist commander in the north, while Franco became commander in the south. With the death of Sanjurjo, Mola established a multi-member governing body for the so-called "Nationalist zone" ("zona nacional") called the National Defence Junta. Based in Burgos, it was nominally headed by Miguel Cabanellas, the most senior participating general.