Rubuta ci gaba don wannan sakin layi - Janar Prezan ya jagoranci rundunar sojojin 4 a 1915-1916, sannan ya zama shugaban rundunar sojojin Rumaniya ta hudu a lokacin yakin Romania daga baya a 1916, a kan sojojin Tsakiyar Tsakiya. Prezan ya jagoranci Rundunar Sojojin Romania a yakin Bucharest
(Nuwamba-Disamba 1916), kuma yayin da waɗannan sojojin suka koma yankin arewa maso gabashin Romania (Moldavia). A watan Yuli da Agusta 1917, Prezan, wanda a lokacin shi ne Shugaban Janar na Janar (kuma ya taimaka wa Lieutenant-Colonel Ion Antonescu) ya samu nasarar dakatar da mamayewar Jamus da Field Marshal August von Mackensen ya jagoranta. Ya ci gaba da aiki a wannan matsayi har zuwa 1920.