 When the Balkan Wars broke out in 1912, Marinković joined her art teachers Petrović and Vukanović as a volunteer nurse in the Army Medical Corps.During World War I, she accompanied her patients as they made the Albanian retreat across the Prokletije Mountains, taking them safely to Corfu.Among the other painters who accompanied the Medical Corps was Kosta Miličević, whose impressionistic style influenced Marinković's later works.