 Ramba uchinyora ndima iyi - Hondo yakatanga muna July 1914. Chisarudzo chevatungamiri vebato, vachitaura nezve kudzivirirwa kwenyika, kuti vaite zvaienderana neparamende Burgfriedenspolitik pamavhoti anosanganisira mari yehondo yaive nemakakatanwa mukati mebato kubva pakutanga. Boka rinorwisana nehondo rakakurumidza kubuda muWürttemberg SPD naClara Zetkin, Fritz Westmeyer nehama dzaThalheimer mumwoyo maro. Vakakurumidza kubatana neboka re pacifist rebato pamwero wenyika, vachizivikanwa seboka reInternational, uye vachitungamirirwa naKarl Liebknecht neshamwari yavo Rosa Luxemburg. Muna 1915 Bertha Thalheimer akanga ari mubatanidzwa-muvambi wesangano raipikisa hondo raSpartacus League, uye akanga ari mumwe wevarongi vemusangano waro wokutanga wakaitirwa muBerlin muna Ndira 1916. Muna September 1915, pamwe chete naErnst Meyer, akamiririra sangano paZimmerwald Conference, musangano wenyika dzakawanda wevashandi vezvematongerwe enyika vakachengetedzwa pedyo neBern muSwitzerland. Akamirirawo Spartacus League mwedzi mitanhatu gare gare pamusangano wekutevera weKienthal. Misangano yacho yaida rugare rwapakarepo, pasina kubatanidzwa kwenharaunda. Vakadana SPD yeGermany kuti irambe mamwe mari yehondo. Mumakore aya Bertha Thalheimer nomukwasha wake Cläre Thalheimer vakanga vachishandawo pamwe chete naLeo Jogiches. Kunyange zvazvo shoko rokurwisana nehondo rakawana mukurumbira, zviremera zvematongerwe enyika muhurumende dzinotungamira dzinotungamira - kunze kweumambo hweRussia - hazvina kubatwa nazvo: muna March 1917 Thalheimer, uyo akanga achibatanidzwa mukurwisana nehondo mumigwagwa yekuratidzira mukupesana nemitemo yematare, akasungwa nokuda kwe mabasa ekurwisana nemauto wegen antimilitaristischer Tätigkeit: muna October 1917 akatongerwa mhosva yekutengesa zvikuru nedare reStuttgart, iro rakamutongera makore maviri mujeri. Anopomerwa pamwe naye, Cläre kana kuti Klara Thalheimer, akasunungurwa. Bertha akapedza rinopfuura gore romutongo wake pedyo neHalle iyo yakanga yachinjwa kuti ishandiswe sejeri. 