Masarautar Romania ta kasance tsaka tsaki a cikin shekaru biyu na farko na yakin duniya na daya, ta shiga a gefen ikon kawance daga 27 ga Agusta 1916 har zuwa lokacin mamaye tsakiyar tsakiyar ya kai ga yarjejeniyar Bucharest a watan Mayu 1918, kafin sake shiga yakin a ranar 10 ga Nuwamba 1918 Ita ce ta fi kowacce rijiyoyin mai a Turai, kuma Jamus ta yi ɗokin sayen man fetur ɗinta, da kuma kayan abinci da ake fitarwa zuwa ketare.Yaƙin neman zaɓe na Romania wani bangare ne na Gabashin Gabashin Yaƙin Duniya na ɗaya, tare da Rumaniya da Rasha waɗanda ke kawance da Biritaniya da Faransa a kan Ƙarfin Tsakiyar Jamus, Austria-Hungary, Daular Ottoman , da Bulgeriya .An gwabza fada tsakanin watan Agusta 1916 zuwa Disamba 1917 a mafi yawan yankunan Romania na yau, ciki har da Transylvania, wanda ke cikin daular Austro- Hungary a lokacin, da kuma Kudancin Dobruja, wanda a halin yanzu yana cikin Bulgaria.Shirin yakin neman zabe na Romania (Hypothesis Z) ya kunshi kai hari kan Austria-Hungary a Transylvania, yayin da suke kare Kudancin Dobruja da Giurgiu daga Bulgaria a kudu.Duk da nasarorin da aka samu a Transylvania, bayan da Jamusawa suka fara taimakawa Austria-Hungary da Bulgaria, sojojin Romania (taimakon Rasha) sun fuskanci koma baya, kuma a karshen 1916 daga cikin yankin Tsohon Mulkin Romania kawai Western Moldavia ya kasance a karkashin mulkin mallaka. kula da sojojin Romania da na Rasha.Bayan nasarar da aka samu na tsaro da yawa a cikin 1917 a Mărăști, Mărășești, da Oituz, tare da janyewar Rasha daga yaƙin bayan juyin juya halin Oktoba , Romania, kusan gaba ɗaya kewaye da Tsakiyar Powers, kuma an tilasta musu ficewa daga yakin.Ta rattaba hannu kan yarjejeniyar Bucharest tare da manyan iko a watan Mayu 1918. A karkashin yarjejeniyar, Romania za ta rasa duk Dobruja zuwa Bulgaria, duk Carpathian ya wuce zuwa Austria-Hungary kuma za ta ba da hayar dukkanin man fetur ga Jamus don 99. shekaru.Duk da haka, manyan kasashen tsakiya sun amince da tarayyar Romania da Bessarabia wadda ba da jimawa ba ta ayyana 'yancin kai daga Daular Rasha bayan juyin juya halin Oktoba kuma ta kada kuri'ar yin tarayya da Romania a watan Afrilun 1918. Majalisar ta rattaba hannu kan yarjejeniyar, amma sarki Ferdinand ya ki rattaba hannu kan yarjejeniyar, yana fatan kulla yarjejeniyar. Nasarar kawance a gaban yamma.A watan Oktoban 1918, Romania ta yi watsi da yarjejeniyar Bucharest kuma a ranar 10 ga Nuwamba 1918, kwana daya kafin sojojin Jamus, Romania ta sake shiga yakin bayan nasarar da aka samu a gaban Macedonia kuma ya ci gaba a Transylvania.Kashegari, Yarjejeniyar Bucharest ta rushe ta hanyar sharuɗɗan Rundunar Sojojin Compiègne.