Piirremallinnus

Piirremallinnus, also known as "fortification by enclosure," is a defensive strategy that involves creating a fortified perimeter around a settlement or city. This method is often used when the natural terrain or existing structures do not provide sufficient defense. The perimeter is typically constructed using walls, ditches, or other barriers to deter and delay potential attackers.

The walls or barriers are usually made of materials such as stone, brick, or earth, depending on the available resources and the level of defense required. The design of the fortifications can vary, but common features include towers, gates, and sometimes moats or other water features to further enhance security.

Piirremallinnus was a common defensive tactic in ancient times, particularly during the Iron Age and the Middle Ages. It was used by various civilizations, including the Romans, who employed it extensively in their empire. The strategy allowed cities to remain self-sufficient and protected from external threats, even if they were not the most powerful or wealthy in the region.

The effectiveness of piirremallinnus depends on several factors, including the quality of the fortifications, the skill of the defenders, and the tactics employed by the attackers. Over time, advancements in military technology and tactics have made fortifications less effective, but the principle of enclosing a settlement for defense remains a fundamental aspect of military strategy.