text: With help from Italy, they succeeded in conquering Yugoslavia within two weeks. They then joined forces with Bulgaria and invaded Greece from the Yugoslavian side. Despite Greek resistance, the Germans took advantage of the Greek army's presence in Albania against the Italians to advance in Northern Greece and consequently conquer the entire country within 3 weeks, with the exception of Crete. However, even with the fierce Cretan resistance, which cost the Nazis the bulk of their elite paratrooper forces, the island capitulated after 11 days of fighting.
  On 1 May the Balkan frontiers were once again reshuffled, with the creation of several puppet states, such as Croatia and Montenegro, the Albanian expansion into Greece and Yugoslavia, Bulgarian annexation of territories in the Greek North, creation of a Vlach state in the Greek mountains of Pindus and the annexation of all the Ionian and part of the Aegean islands into Italy.
  With the end of the war, the changes of the ethnic composition reverted to their original conditions and the settlers returned to their homelands, mainly the ones settled in Greece. An Albanian population of the Greek North, the Cams, were forced to flee their lands because they collaborated with the Italians. Their numbers were about 18 000 in 1944.
  Aftermath of World War II
  On 7–9 January 1945 Yugoslav authorities killed several hundred of declared Bulgarians in Macedonia as collaborators, in an event known as the "Bloody Christmas".