The development of fast-moving reliable tanks led to many ideas of how to slow or destroy them. Large shaped blocks of concrete; strengthened with a steel core; often called Dragon's Teeth were a good way to block a vehicle's progress.
Equally; infantry had to be stopped or channeled away; so engineers on all sides were kept busy constructing wooden and steel frames that held long rolls of taught barbed wire; solid enough to keep away all but the most determined men.
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