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I hate the term fixed. Because unless you are conducting a static defense to the last man (or woman) nothing is fixed. Temporary is a much better word IMHO for firing positions. As offensive positions will continue to move as consolidation or further advancement allows, and blocking force or mobile defenses will do the same sort of thing but in reverse gear
Temporary .... the income tax was temporary. Heck the entire trench system from the Channel to Switzerland was temporary.
Time is relative.
It wouldn't surprise me if the Great Wall of China started as an expedient defence.