 On 28 March , the Greek Central Macedonia Army Section — comprising the 12th and 20th Infantry Divisions — were put under the command of General Wilson , who established his headquarters to the north @-@ west of Larissa . The New Zealand division took position north of Mount Olympus , while the Australian division blocked the Haliacmon valley up to the Vermion range . The RAF continued to operate from airfields in Central and Southern Greece ; however , few planes could be diverted to the theater . The British forces were near to fully motorised , but their equipment was more suited to desert warfare than to Greece 's steep mountain roads . They were short of tanks and anti @-@ aircraft guns and the lines of communication across the Mediterranean were vulnerable , because each convoy had to pass close to Axis @-@ held islands in the Aegean ; despite the British Royal Navy 's domination of the Aegean Sea . These logistical problems were aggravated by the limited availability of shipping and Greek port capacity . 
