The Black Stain ; Alsace-Lorraine was the black stain of France. The ceding of the region to the German Empire in 1871 deeply hurt the French people. The desire for revenge in France was wide-spread.
<bdi><a href="https://en.wikipedia.org/wiki/en:Albert_Bettannier" class="extiw" title="w:en:Albert Bettannier"><span title="French painter (1851-1932)">Albert Bettannier</span></a>
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Deutsches Historisches Museum Berlin