Rubuta ci gaba don wannan sakin layi - Belfort Gap ya sami sabon mahimmanci a cikin jerin yaƙe-yaƙe na Franco-Jamus a cikin karni na sha tara da farkon karni na ashirin. A lokacin yaƙin Franco-Prussian, sojojin Prussian sun mamaye Faransa ta hanyar Wissembourg Gap sannan kuma suka mamaye tsawon Alsace kuma suka kewaye Belfort
, da fatan kwace birnin sannan kuma su hanzarta ta hanyar Belfort Gap zuwa tsakiyar Faransa. A yayin da harin ya kai tsawon watanni, kuma an sanya hannu kan yarjejeniyar tsagaita wuta kafin a kai ga ƙarshe. Yaƙin da ya fi girma ya ba da sakamako mai gamsarwa, duk da haka, kuma a ƙarƙashin sakamakon yarjejeniyar Versailles (1871) Faransa ta ba da Alsace da Lorraine ga sabon daular Jamus. An yi amfani da iyakar yare a 1871 don ƙayyade layin rarrabuwa tsakanin Alsace da Burgundy, kuma Faransa ta sami damar riƙe Belfort. Duk da haka ya sake zama gari na kan iyaka, kuma saboda haka an jefa jerin garuruwa don kare shi daga duk wani harin Jamus a nan gaba. A lokacin da aka fara yakin duniya na farko, sojojin Faransa sun mamaye Jamus ta hanyar Belfort Gap, wanda ya haifar da zubar da jini na Frontiers. Sojoji na baya-bayan nan da suka ci gaba ta hanyar Belfort Gap shi ne na Faransa I Corps a watan Nuwamba 1944, a karkashin Janar De Lattre.