Which action accelerated siege tower collapse when undermining ancient fortifications?

💡 Explanation

Localized intense heat triggers tensile weakening, greatly reducing the structure's load-bearing capacity, because concentrated heating rapidly degrades its structural integrity. Therefore, fires focused on a specific area caused collapse, rather than bracing or other methods that distribute stress.

• Which limitation increased significantly when constructing wooden-hulled ships exceeding around 300 tons in the 18th century?
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