Editing Mannerheim Line (section)

===Unreinforced concrete bunkers in 1919–1924===
During October 1919 Finnish Chief of Staff Major General [[Oscar Enckell]] sited the line, mostly following the original course that von Brandenstein had presented.<ref name="Kronlund5">[[#Kronlund1988|Kronlund 1988]], page 200</ref> Major J. Gros-Coissy, a member of the French military commission, designed the fortifications together with Finnish Lt Col [[Johan Fabritius]].<ref name="Kronlund4">[[#Kronlund1988|Kronlund 1988]], pages 206, 246</ref> During the first building period, Fabritius suggested moving the defensive line further to the south-east. The general staff discussed the issue, but Enckell's earlier plans were followed. Furthermore, insufficient funds resulted in a disagreement between the officers and Enckell resigned in 1924. Construction work was interrupted for a long period.<ref name="UittoGeust2" />

The prime contractor of the fortifications was the Finnish construction company [[Ab Granit Oy]]. The first hundred small [[bunker]]s were built in 1920–1924.<ref name="UittoGeust2" /> For reasons of cost, the first phase hard fortifications were of unreinforced concrete, which provided only partial protection. The compression density of the concrete was too low to offer resistance to anything larger than medium [[artillery]].<ref name="Edwards13">[[#Edwards2006|Edwards 2006]], pp. 111–112</ref>