and from there to Ioannina. On 13 April, attack aircraft from 21, 23 and 33 Squadrons from the Hellenic Air Force (RHAF), attacked Italian positions in Albania. That same day, heavy fighting took place at Kleisoura pass, where the Greek 20th Division covering the Greek withdrawal, fought in a determined manner, delaying Stumme's advance practically a whole day. The withdrawal extended across the entire Albanian front, with the Italians in hesitant pursuit. On 15 April, Regia Aeronautica fighters attacked the (RHAF) base at Paramythia, south of Greece's border with Albania, destroying or putting out of action 17 VVKJ aircraft that had recently arrived from Yugoslavia. General Papagos rushed Greek units to the Metsovon pass where the Germans were expected to attack. On 14 April a pitched battle between several Greek units and the LSSAH brigade—which had by then reached Grevena—erupted. The Greek 13th and Cavalry Divisions lacked the equipment necessary to fight against an armoured unit, and on 15 April were finally encircled and overwhelmed. On 18 April, General Wilson in a meeting with Papagos, informed him that the British and Commonwealth forces at Thermopylai would carry on fighting till the first week of May, providing that Greek forces from Albania could redeploy and cover the left flank. On 21 April, the Germans advanced further and captured Ioannina, the final supply route of the Greek Epirus Army. Allied newspapers dubbed the Hellenic army's fate a modern-day Greek tragedy. Historian and former war-correspondent Christopher Buckley – when describing the fate of the Hellenic army – stated that "one experience[d] a genuine Aristotelian catharsis, an awe-inspiring sense of the futility of all human effort and all human courage." On 20 April, the commander of Greek forces in Albania—Lieutenant General Georgios Tsolakoglou—accepted the hopelessness of the situation and offered to surrender his army, which then consisted of fourteen divisions. Papagos condemned Tsolakoglou's decision to capitulate, although lieutenant general Ioannis Pitsikas and major general Georgios Bakos had warned him a week earlier that morale in the Epirus Army was wearing thin, and combat stress and exhaustion had resulted in officers taking the decision to put deserters before firing squads. Historian John Keegan writes that Tsolakoglou "was so determined... to deny the Italians the satisfaction of a victory they had not earned that... he opened [a] quite unauthorised parley with the commander of the German SS division opposite him, Sepp Dietrich, to arrange a surrender