Which risk increases when a Roman castrum's wooden palisade defenses are rapidly constructed with unseasoned timber?

💡 Explanation

When unseasoned timber is used, differential drying causes warping because moisture gradients induce uneven mechanical stress, weakening joints and leading to structural instability. Therefore structural weakening results, rather than flammability, obstruction, or weathering, which are influenced by other environmental factors independently of wood seasoning.

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