Henry helped his brother, Frederick the Fair, in his fight for the German throne. After the Battle of Mühldorf on 28 September 1322, Henry, King Frederick and 1,300 other Austrian nobles were taken prisoners. Henry spent several years in the Bohemian castle Biirglitz before being released for a ransom of 3,000 ducats and the cession of his rights to Znojmo, Castell, Laa and Weitra. Exhausted by the harsh prison conditions, Henry died at the age of 28. His widow had him buried at Königsfelden Abbey, along with several members of his immediate family.