At the time of his return from Norway , he was appointed field marshal .
Even though Charles returned to Schleswig - Holstein in 1774 , he continued to function as commander - in - chief of the Norwegian army until 1814 .
At the time of Charles ' return Norwegian Norway , Charles was appointed field marshal .
Even though Charles returned to Schleswig - Holstein in 1774 , he continued to function as commander - in - chief of the Norwegian army until 1814 .