Which risk increased for Roman legionaries during sieges when using the 'testudo' formation against defenders?

💡 Explanation

When legionaries used the 'testudo' formation employing overlapping shields for protection, their movement was restricted, making them a denser and more static target, increasing the vulnerability to concentrated fire from defending ballista. Therefore vulnerability to concentrated fire, rather than other options such as entrapment, results because restricted movement made escape less feasible.

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