▁whole ▁province ▁had ▁a ▁strong ▁effect ▁on ▁the ▁Bulgar ian ▁public ▁opinion . ▁Bulgar ian ▁Prime ▁Minister ▁Vas il ▁R ados lav ov ▁was ▁forced ▁to ▁res ign ▁on ▁ 2 0 ▁July ▁ 1 9 1 8 ▁after ▁the ▁failure ▁to ▁ac quire ▁the ▁whole ▁Dob ru ja . ▁Nevertheless , ▁Bulg aria ▁continued ▁to ▁lo bb y ▁Germany ▁and ▁Austria - H ung ary ▁for ▁the ▁an nex ation ▁of ▁the ▁whole ▁province , ▁including ▁the ▁cond omin ium ▁established ▁by ▁the ▁Tre aty ▁of ▁Buch ar est . ▁Representatives ▁of ▁Bulgar ian ▁Dob ru j ans ▁held ▁a ▁second ▁general ▁assembly ▁in ▁Bab ad ag ▁on ▁ 2 3 ▁September , ▁adopt ing ▁a ▁final ▁resolution ▁request ing ▁Dob ru ja ' s ▁incorpor ation ▁into ▁Bulg aria . ▁After ▁negoti ations , ▁a ▁protocol ▁regarding ▁the ▁transfer ▁of ▁the ▁joint ly ▁admin ister ed ▁zone ▁in ▁Northern ▁Dob ru ja ▁to ▁Bulg aria ▁was ▁signed ▁in ▁Berlin ▁on ▁ 2 4 ▁September ▁ 1 9 1 8 , ▁by ▁Germany , ▁Austria - H ung ary , ▁the ▁Ott oman ▁Empire ▁and ▁Bulg aria . ▁In ▁return , ▁Bulg aria ▁agreed ▁to ▁c ede ▁the ▁left ▁bank ▁of ▁the ▁Mar its a ▁river ▁to ▁Turkey . ▁The ▁protocol ▁was ▁de emed ▁a ▁des perate ▁attempt ▁by ▁the ▁Central ▁Pow ers ▁to ▁keep ▁Bulg aria ▁on ▁their ▁side ▁during ▁the ▁V ard ar ▁Off ensive ▁on ▁the ▁Mac ed onian ▁front . ▁In ▁the ▁end , ▁the ▁agreement ▁was ▁short