Battle Castles. Dan Snow

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      Castles survived. Many people continued to regard crenellations and fortifications (however fake) as the hallmarks of aristocracy. A few people even continued to build them, but these modern castles were subtly different from their stark Norman predecessors. A castle like Bodiam in Sussex was built as a stately home in the architectural style of a castle, but with its shallow, easily drainable moat and its windows in the curtain wall it would not have withstood a siege. Edward III spent a vast amount of money on Windsor Castle in the mid-fourteenth century, none of it on improving its defences. Instead he built palatial accommodation for himself and his queen and a set of buildings in the lower bailey for his new Order of the Garter. His son John of Gaunt entirely rebuilt Kenilworth Castle with comfort uppermost in his mind and Carew Castle saw its powerful defences hobbled by the renovations of its owner at the end of the fifteenth century.

      In Scotland, the Stuart dynasty slowly eroded the power of the local elites. King James II was a great fan of artillery. He reduced several castles and increased the power of the Crown before being killed by an artillery piece exploding next to him at the siege of Roxburgh in 1460. Buildings were still built that look like castles – such as Borthwick, south-east of Edinburgh – but in reality they were indefensible. (Borthwick has beautiful machicolations but no crenellations, so anyone actually trying to use them to defend the castle would be exposed to the enemy below.)

      Osaka Castle was raised in the sixteenth century. The siege in 1614–15 is considered by many to be one of the most important events in Japan’s history

      Jose Fuste Raga / Getty Images

      In Spain, Ferdinand and Isabella, who completed the Reconquista or removal of Islamic rule from Iberia in 1492, ordered all the castles in the realm to be handed over to royal control. Although this was only partially enforced, they did order the destruction of many of them. There could be no more tangible a symbol of the assertion of royal, central control over the periphery.

      The process was not irreversible, of course, nor was it universal. Far-away Japan saw a surge in castle building during the anarchic Sengoku period which lasted for around 150 years from the mid-fifteenth century onwards. From this maelstrom of violence a very similar military caste to that in the West came to dominate Japan. Showing a remarkable synchronicity, they chose castles as the totems of their power. It was centuries before central government was able to assert itself fully. The capture and destruction of Osaka Castle in 1868 was a hugely symbolic end to the period of rule by the military elite and a resurgent central government confiscated thousands of castles, destroying around 2,000 of them.

      The British Isles would also see one more rush to fortify as its three component kingdoms descended into a bitter, unanticipated civil war in the seventeenth century. Old castles were suddenly reoccupied and modern earthworks were added. Taking the lead from Italy, fortifications were built with a low profile and arrow-shaped bastions projecting from the walls denying enemy cannon a clear shot at a towering wall. Huge earth ramparts were erected to deflect cannon balls, and complex geometric shapes were adopted to maximize fields of fire of the defenders. King Charles I’s followers fought supporters of Parliament in a drawn-out conflict as these new strongholds sprang up across Britain. With modern improvements to their defences, many medieval castles proved a match for the ad hoc artillery trains of the Parliamentarian forces. Castles like Basing House, Raglan and Pontefract proved a serious obstacle to final Parliamentarian victory. As a result the new Commonwealth regime that succeeded the deposed and executed King Charles ordered the destruction or ‘slighting’ (weakening) of some of the finest castles of the medieval world. Pontefract was wiped off the face of the earth, Nottingham and Montgomery were destroyed. Corfe, Caerphilly and Kenilworth were slighted. Thankfully castles deemed important for coastal defence were left standing. Dover, Arundel and Rochester are evidence of the new regime’s fear of foreign intervention.

      Dan Snow filming on location at the mighty Krak des Chevaliers in Syria

      As I have toured the world looking at some of the most powerful castles ever built, I have been struck by the fact that, eventually even the most perfect castle will fall to its enemy. As the axe fell on the neck of King Charles in Whitehall in January 1649, the defenders of Pontefract Castle were still holding out for the royalist cause. When the news of his death reached them, the defenders negotiated a surrender. Castles can delay or grind an attacker’s force down and they can bolster a cause, but when that cause totally disappears, even the garrison of the greatest castle must submit to the inevitable. Castles may appear to sit, eternal and unshakeable above the fray, but in fact their survival and that of their garrisons depends ultimately on the wider strategic situation.

      Following the war, a new, highly centralized unitary regime sought to bind Britain together as one nation and it was highly significant that they focussed on castles as representing the greatest physical obstacle to this process. Castles were seen, correctly, as the symptom of a political system dominated by an autonomous warrior elite. From now on, even after the restoration of the monarchy and Stuart family, defence would now be left to the State. The Crown built coastal forts and barracks for a national army while the vast majority of aristocrats lived in comfortable modern buildings rather than expensive, dingy, old castles.

      In Western Europe gunpowder, government and fashion brought the era of classic castles with towering battlements to an end. But in many ways their story continues to this day. Man still fortifies. The massive forts in France and Belgium that stalled the Germans in World War One, the Atlantic Wall built by the Germans to protect the coast of Europe from the allies in World War Two, the contemporary walls around Israeli settlements, and the compound at Sangin in Helmand with its Hesco ramparts today, are all born of the same basic urges that drove early man to build the walls of Jericho. These defences, like castles, are force multipliers, they do the job of countless men; they provide a secure base from which to conduct combat operations and prevent an area falling into enemy hands. Perhaps we will never truly see the end of the castle.

      What follows are chapters which feature the six mighty castles that I encountered during the production of the TV series Battle Castle. The contributors to the chapters in the book are leading authorities on each of the castles. Every chapter tells the story not only of the castle in question, its construction and character, but of the historical context behind its creation. Perhaps most importantly of all, each castle was tested in a terrible siege, the result of which would have a very real impact on subsequent history. These are some of the pivotal moments of history seen through the lens of a castle, and the battle for its control.

      Hesco fortifications are pop-up containers into which materials such as sand or stone can be poured. The ones shown here protect a Dutch military base in Afghanistan

      © Picture Contact BV / Alamy