First fortifications in 1914 were simply stone walls which were covered using sand and soil. Herttoniemi. (2000)

In the beginning of year 1915 built the first permanent fortifications.
Wood and stone blocks were the most important building materials before implementing the use of concrete. A trench and recess for ammunition are reinforced using stone wall in Pajamäki. (2000)

At the end of the war the most common reinforce material was concrete. A trench with firing platform and ammunition niche in Paloheinä. (1999)

A trench between background shelters and frontline. Länsimäki. (1983)

Stairs made easier to climb from the trench. Länsimäki. (1999)


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