The naval-history thesis treats the castles as operational tools supported by sea power. The series uses details such as arrow counts only where they help explain that larger system. Laborers and building materials could arrive by water during construction. The same maritime network then helped maintain and supply the finished fortifications. Each castle was a shore base within a wider system for projecting and sustaining royal power.
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Castles as tools of sea power
The central thesis treats Edwardian castles as maritime-power tools because labor, materials, supplies, and maintenance could move by sea.