translate English to German: In the winter of 1915 - 1916 during World War I Kosovo saw a large exodus of Serbian army which became known as the Great Serbian Retreat. Defeated and worn out in battles against Austro-Hungarians, they had no other choice than to retreat, as Kosovo was occupied by Bulgarians and Austro-Hungarians .
Der Nachkriegsboom konnte die massiven Probleme nicht beseitigen.