Dual Alliance Context By Angelicarose.d Period: 1873 to 1875 League of Three Emperors Germany, Russia, HRE 1875 Beginning of bad times for Turkey 1877 Refusal of Turkey of British internal reforms 1877 HRE agrees to Russian intervention in Turkish territory because they get Bosnia and Herzegovia 1877 Russia raises tariffs 50% damaging German export trade 1877 Russia invades Turkey 1878 Russia reached Constaninople