Switch line (military)

A switch line is a trench or defensive line that connectes two trenches that run in parallel to the front line. They are created in locations where the enemy might overrun a trench system, thereby exposing the flanks. The switch line would then act as a frontline trench protecting the flanks.[1][2]

References
  1. https://www.merriam-webster.com/dictionary/switch%20line
  2. https://www.greatwarforum.org/topic/9758-switch-line-what-was-it/?tab=comments#comment-74651


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