British Castles — Text and Context

Correcting the Chronology of the Keep

Ashdown explicitly challenges the established timeline of the rectangular keep. He notes that Clark’s Mediæval Military Architecture, though monumental, now contains obsolete matter because it failed to distinguish between the Saxon burh and the primitive Norman castle. This error, Ashdown argues, skewed the chronology of the rectangular keep and was perpetuated by Oman’s History of the Art of War. The preface singles out J. H. Round’s Geoffrey de Mandeville as an early corrective, differentiating the turris (keep) from the castellum (ward) in medieval texts. Ashdown’s own aim is to bring these revised ideas to a focus for the general reader, a goal that shapes the book’s structure and argumentative tone.

The Concentric Ideal and Its Crusader Roots

A substantial excerpt details the concentric castle, which Ashdown presents as the pinnacle of medieval military architecture. He describes Château Gaillard at Les Andelys as based on the concentric type, though adapted to uneven ground. The castle offered four successive lines of defence: an outer triangular ward, a second ward with five towers, an inner ward with segmental bastions (avoiding vulnerable angles), and finally the keep with early machicoulis. Ashdown attributes the spread of this design to returning Crusaders who had witnessed the triple walls of Constantinople—three miles of fortifications with one hundred towers. He notes that no English castle presents more than three hundred yards of continual front, a striking contrast that underscores the scale of Eastern defences.

Principles of Site Adaptation

Ashdown distills two essential principles of concentric construction: first, that natural features should be incorporated into the defences rather than forcing a rigid plan; second, that each line of defence should be independent, so that capturing one does not compromise the next. He contrasts this with earlier motte-and-bailey or keep-and-base-court types, which paid little regard to terrain. The excerpt shows how castle-builders of the late thirteenth century meticulously adapted their plans to each site, producing ground plans that varied widely. This emphasis on flexibility and integration with landscape marks a clear departure from earlier, more formulaic approaches, and Ashdown’s detailed descriptions of specific castles—such as the ditch 30 feet deep at Les Andelys—give concrete weight to his analytical framework.

Siegecraft and the Limits of Stone

Ashdown does not limit himself to architecture; he also examines how concentric castles were actually attacked. The fall of Château Gaillard involved mining, filling the great ditch, battering the keep with perriers, and escalading the inner ward. He notes that the thousands of returning Crusaders knew the difficulty of assaulting such places, and cost was likely the chief reason concentric designs were not adopted earlier in Britain. The description of Constantinople’s triple walls—where capture of the first defence did not imperil the second, and assailants trapped between lines faced appalling losses—illustrates the tactical logic behind the concentric plan. These passages ground the book’s technical analysis in the practical realities of medieval warfare.

Readers should approach British Castles as a work of its time, one that self-consciously updates earlier authorities while remaining accessible to non-specialists. Ashdown’s emphasis on distinguishing types of earthworks and keeps, and his attention to the Crusader origins of concentric design, give the book a clear argumentative thread. The colour illustrations and plans mentioned in the title page are integral to following his comparisons, so consulting them alongside the text will be especially useful.

There’s something in how those Edwardian writers traced the Saxon burhs beneath the Norman stone—layers of quiet endurance under later ambition. It made me think of Barbarossa, that other old guide, sitting unread but patient. Some histories feel like waiting rooms. Barbarossa — A Reader’s Guide holds that same weathered hush, I find. A familiar shelf, a light left on.