Rubuta ci gaba don wannan sakin layi - Bayan da Romania ta yi yaƙi da Austria-Hungary a ranar 15 ga Agusta 1916, an ba Mackensen umurnin rundunar soji da yawa, tare da Janar Emil von Hell a matsayin shugaban ma'aikata, na Bulgarians, Ottomans, Austro-Hungarians da Jamusawa. Sun taru a arewacin Bulgaria sannan suka ci gaba zuwa Dobruja. A ranar 8 ga watan Satumba, sun dauki manyan biranen biyu a gefen dama na Danube, na farko a cikin rana daya ta hanyar karfi wanda ya fi yawa daga cikin wadanda aka kewaye, wadanda sojojin Mackensen suka mamaye su. Sannan, rukunin sojojin Jamus da Austro-Hungary, wanda Falkenhayn ya ba da umarni, ya kutsa cikin Wallachia ta hanyar Vulkan Pass a cikin Transylvanian Carpathian Mountains yayin da Mackensen ya haye Danube ta hanyar kwace gadaje a gefen hagu don kare injiniyoyin Austro-Hungary waɗanda suka gina gadar mai tsayi. Sojojin Romaniya da abokanan kawancen Rasha sun tilasta komawa tsakanin waɗannan masu tsattsauran ra'ayi. Bayan watanni uku na yaƙi, Kashi biyu bisa uku na yankin Masarautar Romania sun mamaye Kasashen Tsakiya. An kama babban birnin Romania, Bucharest
ta Tsakiyar Tsakiya a ranar 6 ga Disamba, 1916, a ranar haihuwarsa ta 67. Ya hau farin doki ya shiga fadar sarautar Romania.