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In page Franco-Prussian War:

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A third influence was the effect on notions of entrenchment and its limitations. While the American Civil War had famously involved entrenchment in the final years of the war, the Prussian system had overwhelmed French attempts to use similar tactics. With Prussian tactics seeming to make entrenchment and prolonged offensive campaigns ineffective, the experience of the American Civil War was seen as that of a musket war, not a rifle war.[citation needed] Many European armies were convinced of the viability of the "cult of the offensive" because of this, and focused their attention on aggressive bayonet charges over infantry fire. These would needlessly expose men to artillery fire in 1914, and entrenchment would return with a vengeance.[citation needed]