Editing Mannerheim Line (section)

{{Short description|Winter War defensive line used by Finland}}
{{Use dmy dates|date=February 2025}}
{{Infobox military installation
 | name                 = Mannerheim Line
 | location             = [[Karelian Isthmus]]
 | image                = Mannerheim-line.png
 | image_size           = 300px
 | caption              = The Mannerheim Line from the Gulf of Finland to Lake Ladoga
 | built                = 1920–1924, 1932–1939
 | materials            = Wood, boulders, concrete, steel, natural features
 | used                 = 1939–1940
 | type                 = Defensive line
 | controlledby         = Finland
 | garrison             = 
 | commanders           = 
 | battles              = [[Winter War]]
}}

The '''Mannerheim Line''' ({{langx|fi|'''Mannerheim-linja'''}}, {{langx|sv|'''Mannerheimlinjen'''}}) was a [[Defense line|defensive fortification line]] on the [[Karelian Isthmus]] built by [[Finland]] against the [[Soviet Union]]. While this was never an officially designated name, during the [[Winter War]] it became known as the Mannerheim Line, after Finnish Army's then commander-in-chief [[Field marshal (Finland)|Field Marshal]] [[Carl Gustaf Emil Mannerheim|Baron Carl Gustaf Emil Mannerheim]]. The line was constructed in two phases: 1920–1924 and 1932–1939. By November 1939, when the Winter War began, the line was by no means complete.<ref name="Edwards13" /><ref>{{Cite web |title=Mannerheim Line {{!}} Finnish defense system {{!}} Britannica |url=https://www.britannica.com/topic/Mannerheim-Line |access-date=2025-03-02 |website=www.britannica.com |language=en}}</ref>