Haeften was arrested on 23 July 1944, three days after the 20 July Plot, the German military's failed assassination attempt against Hitler at the Wolfsschanze in East Prussia.
Haeften was detained on 23 July 1944, just three days following the 20 July Insurrection, the German military's ill-fated plot to assassinate Hitler at the Wolf's Lair in East Prussia.