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The National Bands Agreement (Greek : Σύμφωνο των Εθνικών Ομάδων) was an agreement concluded on 5 July 1943 at the village of Liaskovo, between the British military mission to occupied Greece and the three main Greek Resistance organizations, EAM-ELAS, EDES and EKKA. Its aim was to coordinate the actions of the Resistance movement in Greece, including the establishment of a joint headquarters under the aegis of the British GHQ Middle East .
The negotiations were begun by the British military mission in March 1943 as an attempt to avoid a repeat of the clashes between the Communist-controlled ELAS, by far the largest armed guerrilla organization, and the other groups. In addition, the British were concerned with presenting the Germans with the real possibility of an Allied invasion of the Balkans, and an increased and coordinated guerrilla effort was vital for this (Operation Animals, cf. also Operation Mincemeat and Operation Barclay).
On 6 June, representatives from ELAS (Colonel Stefanos Sarafis and Andreas Tzimas), EDES (Colonel Napoleon Zervas and Komninos Pyromaglou) and the British mission (Eddie Myers and Christopher Woodhouse) assembled in the village of Liaskovo. The negotiations lasted on-and-off for a month, until the agreement was signed on 5 July. EKKA, which at the time did not have any armed force in the field due to its forcible disarmament by ELAS, signed the agreement on 18 July, represented by Colonel Dimitrios Psarros and Georgios Kartalis. The Panhellenic Liberation Organization (PAO), another nationalist group active in Macedonia but also hostile to ELAS, was also considered for later inclusion.
In the event, the agreed joint headquarters, where ELAS had the majority, failed to coordinate the guerrillas' movements, best evidenced following the capitulation of Italy in September 1943, when each organization tried to get as much as it could from the spoils of the Italian army of occupation. ELAS seized the majority, and clashes between the groups began again in October 1943 with an attack on EDES by ELAS forces.
The Greek People's Liberation Army was the military arm of the left-wing National Liberation Front (EAM) during the period of the Greek resistance until February 1945, when, following the Dekemvriana clashes and the Varkiza Agreement, it was disarmed and disbanded. ELAS was the largest and most significant of the military organizations of the Greek resistance.
The Greek resistance involved armed and unarmed groups from across the political spectrum that resisted the Axis occupation of Greece in the period 1941–1944, during World War II. The largest group was the Communist-dominated EAM-ELAS. The Greek Resistance is considered one of the strongest resistance movements in Nazi-occupied Europe, with partisans, men and women known as andartes and andartisses, controlling much of the countryside prior to the German withdrawal from Greece in late 1944.
The National Republican Greek League was a major anti-Nazi resistance group formed during the Axis occupation of Greece during World War II.
National and Social Liberation was a Greek Resistance movement during the Axis occupation of Greece. It was founded in autumn 1942 by Colonel Dimitrios Psarros and politician Georgios Kartalis.
Evripidis Bakirtzis, born in Serres, Ottoman Empire, was a Hellenic Army officer and politician. Dismissed from the army twice due to his participation in pro-republican coup attempts and sentenced to death, later during the Axis Occupation of Greece, in World War II he co-founded the National and Social Liberation (EKKA) resistance group along with Dimitrios Psarros and was the military head of the organization. He later joined and was a prominent member of the National Liberation Front (EAM) and its military wing the Greek People's Liberation Army (ELAS). He served as head of the Political Committee of National Liberation (PEEA), a government of Greek Resistance-held territories also called the "Mountain Government", from 10 March to 18 April 1944. He was nicknamed "the Red Colonel", from his pen name in the newspaper of the Communist Party of Greece, the Rizospastis.
The occupation of Greece by the Axis Powers began in April 1941 after Nazi Germany invaded the Kingdom of Greece in order to assist its ally, Italy, in their ongoing war that was initiated in October 1940, having encountered major strategical difficulties. Following the conquest of Crete, the entirety of Greece was occupied starting in June 1941. The occupation of the mainland lasted until Germany and its ally Bulgaria withdrew under Allied pressure in early October 1944, with Crete and some other Aegean islands being surrendered to the Allies by German garrisons in May and June 1945, after the end of World War II in Europe.

Napoleon Zervas was a Hellenic Army officer and resistance leader during World War II. He organized and led the National Republican Greek League (EDES), the second most significant, in terms of size and activity, resistance organization against the Axis Occupation of Greece.
Dimitrios Psarros was a Greek army officer, founder and leader of the resistance group National and Social Liberation (EKKA), the third-most significant organization of the Greek Resistance movement after the National Liberation Front (EAM) and the National Republican Greek League (EDES). In 1944, he was executed by Greek communist forces.

Athanasios Klaras, better known by the nom de guerreAris Velouchiotis, was a Greek journalist, politician, member of the Communist Party of Greece, the most prominent leader and chief instigator of the Greek People's Liberation Army (ELAS) and the military branch of the National Liberation Front (EAM), which was the major resistance organization in occupied Greece from 1942 to 1945.
The Dekemvriana refers to a series of clashes fought during World War II in Athens from 3 December 1944 to 11 January 1945. The conflict was the culmination of months of tension between the left-wing EAM, some parts of its military arm, the ELAS, stationed in Athens, the KKE and the OPLA from one side and from the other side, the Greek Government, some parts of the Hellenic Royal Army, the Hellenic Gendarmerie, the Cities Police, the Organization X, among others and also the British Army.
The 4th "Ali Demi" Battalion was a battalion under the 15th Regiment of Greek People's Liberation Army, founded during the Second World War. It comprised both from Cham Albanians and Greeks, of the region of Epirus and was established in May 1944.
Operation Harling, also known as the Battle of Gorgopotamos in Greece, was a World War II mission by the British Special Operations Executive (SOE), in cooperation with the Greek Resistance groups EDES and ELAS, which destroyed the heavily guarded Gorgopotamos viaduct in Central Greece on 25 November 1942. This was one of the first major sabotage acts in Axis-occupied Europe, and the beginning of a permanent British involvement with the Greek Resistance.
Georgios Kartalis was a Greek politician.
The Greek Civil War took place from 1946 to 1949. The conflict, which erupted shortly after the end of World War II, consisted of a communist-dominated uprising against the established government of the Kingdom of Greece. The opposition declared a people's republic, the Provisional Democratic Government of Greece, which was governed by the Communist Party of Greece (KKE) and its military branch, the Democratic Army of Greece (DSE). The rebels were supported by Albania and Yugoslavia. With the support of the United Kingdom and the United States, the Greek government forces ultimately prevailed.
The Feneos Executions is the name given to a series of killings committed by the Greek People's Liberation Army (ELAS) resistance group, and especially by its secret police OPLA, in the Feneos area of Corinthia, Greece, during the first stages of the Greek Civil War, while the country was still occupied by the Axis Powers.
The Lebanon conference was held on May 17–20, 1944, between representatives of the Greek government in exile, the pre-war Greek political parties, and the major Greek Resistance organizations, with the British ambassador Reginald Leeper in attendance. The conference occurred after an anti-monarchist mutiny among the Greek military the previous month. PM Georgios Papandreou's policy was to create a National Unity government with the participation of the communist-dominated EAM. Finally there was a partial agreement, though tensions and disagreements remained.
The Panhellenic Liberation Organization, was a Greek resistance organization against the Axis occupation of Greece. It was founded in 1941 by a group of Greek army officers, under the name Defenders of Northern Greece, employing methods of non violent resistance. In 1943, YVE was renamed as the Panhellenic Liberation Organization (PAO), shifting its focus towards armed struggle. In the August of the same year it came into conflict with Greek People's Liberation Army (ELAS), a communist-led resistance organization. PAO was defeated in the ensuing civil war and its remnants turned towards collaboration with the Germans.
Operation Animals was a World War II mission by the British Special Operations Executive (SOE), in cooperation with the Greek Resistance groups ELAS, Zeus, EDES, PAO and the United States Army Air Force. The operation took place between 21 June and 11 July 1943 and included an organized campaign of sabotage in Greece, to deceive the Axis Powers into believing that Greece was the target of an Allied amphibious landing, instead of Sicily. Despite the mission's success, the Greek civilian population suffered from mass reprisals and British intervention into the internal affairs of the Greek resistance exacerbated the tensions between its various components.
Red Terror is a term used by some historians to describe incidents of violence against civilians that were considered "traitors" by EAM, because these civilians allegedly collaborated with groups that wanted Greece to be under the political, economic and military influence of other foreign forces; either of Axis powers, from 1943 to 1944 or under British influence, from 1943 to 1949 and during the Greek Civil War. In the countryside, operations were conducted by the ELAS; in cities, by the Organization for the Protection of the People's Struggle (OPLA).