Nevertheless, the rivalry between ELAS and the republican EDES and EKKA groups continued, and on 14 April 1944, the EKKA forces were attacked by ELAS. The 5/42 Evzones Regiment held out for three days, but was then forced to retreat. A number of men managed to escape and cross the Corinthian Gulf to the Peloponnese. The majority however remained behind with Col. Psarros, were taken prisoner and later executed. It remains disputed if Psarros was killed during the battle or in captivity. The event caused a major shock in the Greek political scene since Psarros was a well-known republican, patriot and anti-royalist. The apparent determination of EAM-ELAS to monopolize the resistance movement caused concerns about its post-war intentions, leading to a more decisive opposition from the part of the other resistance groups and the pre-war political establishment. The event is considered a precursor of the Greek Civil War that broke out a year later (see Dekemvriana).