Zealand Brigade and the 16th Australian Brigade. For the next three days, the advance of the 9th Panzer Division was stalled in front of these resolutely held positions. A ruined castle dominated the ridge across which the coastal pass led to Platamon. During the night of 15 April, a German motorcycle battalion supported by a tank battalion attacked the ridge, but the Germans were repulsed by the New Zealand 21st Battalion under Lieutenant Colonel Neil Macky, which suffered heavy losses in the process. Later that day, a German armoured regiment arrived and struck the coastal and inland flanks of the battalion, but the New Zealanders held. After being reinforced during the night of the 15th–16th, the Germans assembled a tank battalion, an infantry battalion and a motorcycle battalion. The infantry attacked the New Zealanders' left company at dawn, while the tanks attacked along the coast several hours later. The New Zealanders soon found themselves enveloped on both sides, after the failure of the Western Macedonia Army to defend the Albanian town of Korça that fell unopposed to the Italian 9th Army on 15 April, forcing the British to abandon the Mount Olympus position and resulting in the capture of 20,000 Greek troops. The New Zealand battalion withdrew, crossing the Pineios river; by dusk, they had reached the western exit of the Pineios Gorge, suffering only light casualties. Macky was informed that it was "essential to deny the gorge to the enemy until 19 April even if it meant extinction". He sank a crossing barge at the western end of the gorge once all his men were across and set up defences. The 21st Battalion was reinforced by the Australian 2/2nd Battalion and later by the 2/3rd. This force became known as "Allen force" after Brigadier "Tubby" Allen. The 2/5th and 2/11th battalions moved to the Elatia area south-west of the gorge and were ordered to hold the western exit possibly for three or four days. On 16 April, Wilson met Papagos at Lamia and informed him of his decision to withdraw to Thermopylae. Lieutenant-General Thomas Blamey divided responsibility between generals Mackay and Freyberg during the leapfrogging move to Thermopylae. Mackay's force was assigned the flanks of the New Zealand Division as far south as an east–west line through Larissa and to oversee the withdrawal through Domokos to Thermopylae of the Savige and Zarkos Forces and finally of Lee Force; Brigadier