Danckwardt was named fänrik of the Västgöta-Dal Regiment in 1697 under Major Hugo Hamilton.
Hamilton was also responsible for Danckwardt's promotions to Major in 1711, and to Överstelöjtnant (Lieutenant colonel) in 1712.
[1] After the debacle at Poltava, Hamilton's regiment was moved from Stockholm to Malmö, where it participated in the Battle of Helsingborg in 1710.
When the executioner at last arrived, he had to attempt the decapitation of Danckwardt twice before succeeding on 16 September 1719 in Gothenburg.
Danckwardt's fellow officers were also later sentenced by the court martial to the death penalty, but were pardoned.