Hermann's loyalty persisted during the Hungarian civil war, when Sigismund's kingdoms of Croatia and Hungary were being claimed by King Ladislaus of Naples with the support of Sigismund's rebellious vassals.
Kesetiaan Herman bertahan selama perang saudara Hongaria, ketika Kerajaan Kroasia dan Hungaria Sigismund dituntut oleh Raja Ladislao dari Napoli dengan dukungan pengikut Sigismund yang memberontak.