On 25 and 26 March 1799, Heinrich fought under Archduke Charles at the Battle of Stockach and the Battle of Winterthur in May. He led a division of Archduke Charles' Center at the First Battle of Zurich in June. His immediate commander, Olivier, Count of Wallis received a mortal wound during the engagement. Between March and September 1800 he defended the Vorarlberg and the Tyrol. Emperor Francis II named him Proprietor (Inhaber) of "Reuss-Plauen" Infantry Regiment # 17 in 1801. He remained the proprietor until his death. His brother Heinrich XIII was proprietor of "Reuss-Greiz" Infantry Regiment # 55 from 1803 to 1809, and "Reuss-Greiz" Infantry Regiment # 18 from 1809 to 1817.