[9] In 1914, Jannasch, along with Albert Einstein, Otto Lehmann-Russbuldt, Kurt von Tepper-Laski, and others, founded the Bund Neues Vaterland (New Fatherland League).

[5] In 1916, the German authorities prohibited the BNV from any public activity,[11] and in March, Jannasch was arrested and imprisoned, without trial, for four months on charges of treason.

[12] The Black Horror referred to 'repeated charges voiced in the German press and elsewhere of wholesale abuses of women and children committed by the French colored troops garrisoned in the occupied territory along the Rhine'.

[14] Kuhlman writes that in an article for a German magazine in November 1920:Jannasch compared the crusade's antics to the German folktale the "Pied Piper of Hamelin," in which the piper (in this case, the Rhineland Horror campaigners) played irresistible music (of revenge, chivalric honor, and female protection) while making irresponsible claims (about the African soldiers).

The German people, observed Jannasch, were being lured into a never-ending cycle of revenge by the campaign's inflated claims of dishonour at the hands of the colonial troops.

[13] Friedrich Wilhelm Foerster also published a pamphlet in 1921 condemning the conduct of Germans during the war, but he and Jannasch were exceptions to the prevailing spirit in postwar Germany.

[6] Of this, Jannasch wrote that:The courageous proclamation of the truth is taxed with treason, and the person who obstinately sticks to this task is immediately singled out for the bullets and clubs of the Pangermanists.

[5] In 1923, she established a 'fund for reconciliation with the French and Belgian people', in an effort to acknowledge and make reparations for the destructive impact of the German troops in occupied areas of France of Belgium.

[6] Jannasch lectured widely, and attempted to counter anti-French propaganda in the German press by publishing information about pacifist efforts and Franco-German reconciliation.