The process of fortification
Work prepared for defense
With this fortification, Victor will have no power over you.
The first line of fortification was the work of Francis I.; the second line and the donjon date back to the 11th century.
The main fortification of Copenhagen was the powerful Trekroner (Three Crown) battery at the northern end of the sea-front.
It had a fortification such as became usual in later bridges for defence or for the enforcement of tolls.
The r6th-century lines of fortification enclose a very much larger area than the Roman city, forming a great loop to the west, and also including a considerable space on the left bank of the river.