A virtual civil war was now being waged under the eyes of the Germans. In October 1943, ELAS attacked EDES in Epirus, where the latter organization was the dominant resistance group, by transferring units from the neighbouring regions. This conflict continued until February 1944, when the British mission in Greece succeeded in negotiating a ceasefire (the Plaka agreement) which in the event proved to be only temporary. The attack led to an unofficial truce between EDES and the German forces in Epirus under General Hubert Lanz. But the fight continued amongst ELAS and the other minor resistance groups (like "X"), as well as against the Security Battalions, even in the streets of Athens, until the German withdrawal in October 1944. In March, EAM established its own rival government in Free Greece, the Political Committee of National Liberation, clearly staking its claim to a dominant role in post-war Greece. Consequently, on Easter Monday, 17 April 1944, ELAS forces attacked and destroyed the EKKA's 5/42 Regiment, capturing and executing many of its men, including its leader Colonel Dimitrios Psarros. The event caused a major shock in the Greek political scene, since Psarros was a well-known republican, patriot and anti-royalist. For EAM-ELAS, this act was fatal, as it strengthened suspicion of its intentions for the post-Occupation period, and drove many liberals and moderates, especially in the cities, against it, cementing the emerging rift in Greek society between pro- and anti-EAM segments.