While besieging Alesia, which consequence did Caesar's Roman army face when their circumvallation trenches lacked sufficient depth?

💡 Explanation

When the circumvallation trenches lacked sufficient depth, cavalry breaches ensued because shallow trenches enabled enemy horsemen to jump across and harass the besiegers. Therefore cavalry breaches resulted, rather than artillery undermining which is independent of trench depth, disease which relate more to camp sanitation, or starvation due to siege effectiveness.

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