Which structural vulnerability increased within late-Roman castra when defensive perimeters significantly expanded?

💡 Explanation

When defensive perimeters expanded, the fixed number of legionaries resulted in reduced manpower density per length of wall, meaning larger gaps between defenders increasing likelihood of breaches or scaling. Therefore, reduced manpower density resulted, rather than undermining (based on soil type), thermal stress (fixed materials property), or acoustic resonance (unrelated to perimeter size).

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