In February 1942, EAM, an organization controlled by the local Communist Party formed a military corps, ELAS, that would first operate in the mountains of Central Greece, with Aris Velouchiotis, a communist activist, as their chief captain. Later, on 28 July 1942, a centrist ex-army officer, Colonel Napoleon Zervas, announced the foundation of the National Groups of Greek Guerrillas (EOEA), as EDES' military arm, to operate, at first, in the region of Aetolia-Acarnania. National and Social Liberation (EKKA) also formed a military corps, named after the famous 5/42 Evzone Regiment, under Col. Dimitrios Psarros, that was mainly localized in the area of Mount Giona.