Fortification Upgrades (1673 to 1675) was an re-organization of military forces and strengthening of the defenses of Norway. Ulrik Frederik Gyldenløve, Count of Laurvig was statholder of Norway from 1664 to 1699. In 1673 Ulrik Fredrik Gyldenløve conducted a tour of facilities, after which he recommended upgrades to both the fortresses and the military forces. During the summer of 1675, 1800 men were kept at work on the fortresses at Akershus, Fredrikstad, and Fredrikshald.