After the French defeat in the Franco-Prussian War of 1870-1871, almost all of the Moselle department, along with Alsace and portions of the Meurthe and Vosges departments, was returned to the German Empire by the Treaty of Frankfurt on the ground that the population in those areas spoke German dialects.

After the French defeat in the Franco-Prussian War of 1870 – 1871, 4 % of the Vosges department in the extreme northeast of the department was annexed to the German Empire by the Treaty of Frankfurt on the ground that the people there spoke Germanic dialects.

After the French defeat in the Franco-Prussian War of 1870-1871, the northeastern part of the Meurthe département was annexed to the German Empire by the Treaty of Frankfurt.

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