 As the invading Germans advanced deep into Greek territory , the Epirus Army Section of the Greek army operating in Albania was reluctant to retreat . However , by the middle of March , especially after the <unk> offensive , the Greek army had suffered , according to British estimates , 5 @,@ 000 casualties . The Italian offensive revealed a " chronic shortage of arms and equipment . " The Greeks were fast approaching the end of their logistical tether . 
