The Royal Prussian Army (German: Königlich Preußische Armee) was the army of the Kingdom of Prussia. It was vital to the development of Brandenburg-Prussia as a European power.
The Prussian Army had its roots in the core mercenary forces of Brandenburg during the Thirty Years' War.
Elector Frederick William developed it into a viable standing army, while King Frederick William I of Prussia dramatically increased its size.
King Frederick the Great led the disciplined Prussian troops to victory during the 18th century Silesian Wars and increased the prestige of the Kingdom of Prussia.