puolustuslinja
Puolustuslinja, in Finnish usage, is the term for a defense line or line of defense. It refers to a sequence of defensive positions and supporting measures designed to slow, channel, or stop an attacking force. A puolustuslinja typically combines natural terrain features such as ridges, rivers, and lakes with man-made fortifications, obstacles and integrated firepower, supported by logistics and command and control arrangements. The concept emphasizes delaying action, conserving forces, and concentrating combat power at decisive points, often with reserves, artillery, and air defense coordinating the defense.
Historically, Finland has used the term to describe several well-known defensive systems. The Mannerheim Line (Mannerheim-linja)
In contemporary doctrine, puolustuslinja remains a generic concept for layered defenses that aim to channel an