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In his 1841 dictionary, Noah Webster observed bivouac to be a French borrowing having military origins. He defined the noun bivouac as "the guard or watch of a whole army, as in cases of great danger of surprise or attack" and the verb as "to watch or be on guard, as a whole army." The French word is derived from the Low German word biwacht, which translates to "by guard." Germans used the word specifically for a patrol of citizens who assisted the town watch at night. Today, bivouac has less to do with guarding and patrolling than it does with taking shelter.
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“Bivouac.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bivouac. Accessed 7 Jul. 2026.
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