the Greek forces defending the Metaxas Line capitulated unconditionally following the collapse of Greek resistance east of the Axios river. In a 9 April estimate of the situation, Field Marshal List commented that as a result of the swift advance of the mobile units, his 12th Army was now in a favourable position to access central Greece by breaking the Greek build-up behind the Axios river. On the basis of this estimate, List requested the transfer of the 5th Panzer Division from First Panzer Group to the XL Panzer Corps. He reasoned that its presence would give additional punch to the German thrust through the Monastir Gap. For the continuation of the campaign, he formed an eastern group under the command of XVIII Mountain Corps and a western group led by XL Panzer Corps. Breakthrough to Kozani By the morning of 10 April, the XL Panzer Corps had finished its preparations for the continuation of the offensive and advanced in the direction of Kozani. The 5th Panzer Division, advancing from Skopje encountered a Greek division tasked with defending Monastir Gap, rapidly defeating the defenders. First contact with Allied troops was made north of Vevi at 11:00 on 10 April. German SS troops seized Vevi on 11 April, but were stopped at the Klidi Pass just south of town. During the next day, the SS regiment reconnoitered the Allied positions and at dusk launched a frontal attack against the pass. Following heavy fighting, the Germans broke through the defence. By the morning of 14 April, the spearheads of the 9th Panzer Division reached Kozani. Olympus and Servia passes Wilson faced the prospect of being pinned by Germans operating from Thessaloniki, while being flanked by the German XL Panzer Corps descending through the Monastir Gap. On 13 April, he withdrew all British forces to the Haliacmon river and then to the narrow pass at Thermopylae. On 14 April, the 9th Panzer Division established a bridgehead across the Haliacmon river, but an attempt to advance beyond this point was stopped by intense Allied fire. This defence had three main components: the Platamon tunnel area between Olympus and the sea, the Olympus pass itself and the Servia pass to the south-east. By channelling the attack through these three defiles, the new line offered far greater defensive strength. The defences of the Olympus and Servia passes consisted of the 4th New Zealand Brigade, 5th New