Pedzisa mutsara unotevera: Pakati pekuvhiyiwa, Hahn akadzokera kuBerlin, kwaakakwanisa kudzokera kubhabhoritari yake yekare uye kubatsira Meitner pakutsvakurudza kwake. Muna September 1917 aiva mumwe wevatatu vakuru vakuru, vakapfeka yunifomu yeAustria, vakatumirwa kuIsonzo front muItaly kuti vawane nzvimbo yakakodzera yekurwisa, vachishandisa "minenwerfers" ichangobva kugadzirwa iyo panguva imwe chete yakakanda mazana emidziyo yegasi rine chepfu pazvinangwa zvevavengi. Vakasarudza nzvimbo umo makomba eItaly akanga akavharirwa mumupata wakadzika kuitira kuti gore regasi rirambe riripo. Hondo yeCaporetto yakaputsa mutsetse weItaly uye Masimba epakati akakunda chikamu chikuru cheItaly yokuchamhembe. Muna 1918
Kurwisa kweGermany kumadokero kwakapwanya mitsetse yevaAllies pashure pokusunungurwa kukuru kwegasi kubva kumagandanga avo. Muchirimo ichocho Hahn akabatwa nechepfu netsaona nephosgene apo akanga achiedza mufananidzo mutsva wegasi. Pakupera kwehondo akanga ari mumunda ari mufti pabasa rakavanzika rokuedza hari iyo yaipisa ndokusunungura gore rearsenicals.