Fortifications are militaryconstructions designed for defensivewarfare. They have been used for many thousands of years, in a variety of increasingly complex designs. The practice of improving an area's defense is also known as "fortification". Many military installations are known as forts, although they are not always "fortified".
... miles northwest of Cologne) in 1380 and died near Zwolle (52 miles east-north-east of Amsterdam) in 1471. His paternal name was Hemerken or Hammerlein, "little hammer." ...