 He survived the Battle of Lipany in 1434 and, in 1437, he retreated with his last remaining disciples to his small castle Sion in what is now the Czech Republic.There he was besieged and after four months the castle defenses were successfully breached by the combined efforts of Bohemian troops under Hynek Ptáček and Hungarian troops led by Michael Ország.Roháč was hanged on Emperor Sigismund's order three days later in Prague.