Battles & Wars › Medieval wars
Castles and siege warfare
c. 950–1500· Idea, religion or movement· Strategy & tactics
Mostly agreedGood evidence; some details, dates or numbers uncertain.
Fortified strongholds, and the methods for taking them, dominated medieval warfare in Europe and the Middle East.
See it on the Battles & Wars map →What happened
Early castles were often earth-and-timber motte-and-baileys, a mound with a wooden tower beside a fenced yard, quick to build. Stone keeps followed, then concentric rings of walls and towers. A small garrison could hold off an army and control the countryside around. Attackers tried starvation, siege towers, battering rams, tunneling under walls and stone-throwing engines; the counterweight trebuchet, from the late 1100s, hurled stones of 100 kg or more. Most medieval wars were mainly sieges, not open battles.
Why it matters
Castles let a few soldiers hold territory, spreading power to local lords. Wars became slow contests of sieges until cannon made high walls vulnerable.
Think of it like
A castle worked like a fortified property office: whoever held it collected the rents and controlled the land around it.
How we know
Thousands of surviving castles and ruins, such as Krak des Chevaliers in Syria and Edward I's castles in Wales, plus chronicles and royal building accounts.
Still debated
Historians debate whether castles were mainly military strongholds or symbols of status and centers of administration; most were all three.
Inside this (1)
Connections (10)
▸Battle of Hastings was followed by a wave of Castles and siege warfareWell documented
The connection
Victorious but vastly outnumbered by a hostile population, the Normans held England by building castles fast: first earth-and-timber mottes, often within weeks, then stone keeps such as the Tower of London's White Tower. Perhaps 500 or more were built by 1100, pinning down towns and countryside.
When and how
England and Wales, 1066 to about 1100; William the Conqueror and his barons.
How we know
The Anglo-Saxon Chronicle complains of castle building; earthworks and keeps like the White Tower and Colchester survive, and Domesday Book records houses cleared for castles.
Debates and open questions
How many castles England had before 1066, and how many Norman castles were military rather than symbolic, are debated.
▸Castles and siege warfare lost their edge to Gunpowder and cannonMostly agreed
The connection
Tall, thin stone walls were built to stop climbers, not cannonballs. By the mid-1400s heavy bombards could breach them in days: France retook dozens of English-held castles in Normandy in 1449–1450. In 1453 Ottoman guns battered down parts of Constantinople's great walls. Engineers answered with low, thick, angled bastion forts, the 'trace italienne'.
When and how
Europe and the Mediterranean, mid-1400s to 1500s; the Bureau brothers' French artillery, Ottoman siege guns, Italian fortress engineers.
How sure are we?
Chronicles record suddenly short sieges; surviving bombards, and star forts built from the 1500s, show the shift in design.
Debates and open questions
How quickly cannon made castles obsolete is debated; many old castles stayed useful against raiders and rebels into the 1600s.
▸Castles and siege warfare anchored the crusader states during The CrusadesWell documented
The connection
The crusader states never had enough knights to hold open country, so they relied on castles. Great fortresses like Krak des Chevaliers, held by the Hospitallers, guarded roads and borders with small garrisons. After the disaster at Hattin, fortified coastal cities, first Tyre and, from 1191, Acre, let the crusaders hang on for another century.
When and how
Today's Syria, Lebanon, Israel, Palestine and Jordan, 1099–1291; builders included the kings of Jerusalem and the military orders.
How we know
Ruins survive across the region; chronicles and charters record their building, garrisons and sieges by Saladin and the Mamluks.
Debates and open questions
How far crusader castle design copied Byzantine and Islamic models, or shaped castles back in Europe, is debated.
▸Viking raids and conquests pushed Europe toward Castles and siege warfareMostly agreed
The connection
Viking raiders struck fast and left before armies could gather. Rulers responded with fixed defenses: Alfred the Great's network of fortified towns, or burhs, in England; fortified bridges on Frankish rivers; and local strongholds. This helped prepare the shift to lord-held private castles, which spread widely in France after about 950.
When and how
England and the Frankish lands, 860s–900s; Alfred the Great's burhs and Charles the Bald's fortified river bridges.
How sure are we?
The Burghal Hidage, a document listing Alfred's burhs, Frankish royal orders for fortified bridges, and excavated town defenses.
Debates and open questions
How much the castle boom came from Viking pressure versus the breakdown of royal power in France is debated; probably both.
▸Siege and Battle of Vienna (1683) was a classic test of Castles and siege warfareWell documented
The connection
Vienna showed siege warfare in its gunpowder form. Instead of tall castle walls, the city relied on low, thick bastions and outworks built to absorb cannon fire. The Ottomans answered with zigzag trenches and tunnels packed with explosives, while defenders dug countermines to intercept them. The city held until relief arrived, the outcome every besieged town hoped for.
When and how
Vienna, July to September 1683; Ottoman engineers under Kara Mustafa against Count Starhemberg's garrison.
How we know
Diaries from inside the city and an Ottoman camp journal record mines, countermines and breaches day by day; contemporary siege plans survive, and the Mölker Bastei, a piece of the bastions, still stands.
Debates and open questions
How close Vienna came to falling is debated; some historians think a few more days would have done it, others that the defense could have held.
▸Wall and Tower of Neolithic Jericho began the long story of walls behind Castles and siege warfareMostly agreed
The connection
Jericho's wall is one of the first known attempts to enclose a settlement in stone. Over the next 9,000 years, walls, towers, ditches and gates grew into city walls and medieval castles, while attackers developed ladders, rams, mining and siege engines to beat them.
When and how
From Jericho around 8000 BC, through fortified Bronze Age cities, to the castles of Europe and the Middle East, about 950–1500.
How sure are we?
The long development of fortification is well documented by archaeology; Jericho is an early starting point, not a direct ancestor of castles.
Debates and open questions
Jericho's own purpose is debated, and walls were invented many times in different places, so this long story is really many parallel ones.
▸Assyrian siege of Lachish is the best-pictured early ancestor of Castles and siege warfareMostly agreed
The connection
The basic contest at Lachish, walls, gates and towers against ramps, rams, archers and hunger, was the same one fought at medieval castles some 2,000 years later. Later engineers added stone-throwing engines, from Greek catapults to the medieval trebuchet, and castle builders added stronger gatehouses, but the logic held until cannon changed it.
When and how
Lachish in 701 BC; medieval castle sieges in Europe and the Middle East from about 950 to 1500.
How sure are we?
The link is continuity, not direct descent: similar methods appear in Greek, Roman and medieval siege accounts, while the Lachish reliefs themselves were rediscovered only in the mid-1800s.
Debates and open questions
How much medieval engineers learned from ancient texts, rather than reinventing methods through practice, is debated.
▸Siege of Tyre (332 BC) showed siege engineering later used in Castles and siege warfareMostly agreed
The connection
Tyre combined most of the ancient siege toolkit: causeways, wheeled towers, rams, catapults and a sea blockade. Greek and Roman engineers wrote these methods into manuals that Byzantine and later commanders inherited. Medieval castle sieges used the same basic tools: ramps, towers, rams, mining and stone-throwing engines.
When and how
Tyre, 332 BC; the methods passed through Hellenistic and Roman practice to medieval sieges in Europe and the Middle East, about 950–1500.
How sure are we?
Ancient engineering texts, such as those of Philo of Byzantium and Vitruvius, describe the same machines. A line from Tyre itself is a broad pattern, not a documented chain.
Debates and open questions
How much medieval engineers drew on ancient manuals, rather than reinventing methods or learning from Byzantine and Islamic practice, is debated.
▸First Jewish–Roman War: Jerusalem (AD 70) and Masada featured, at Masada, a famous example of Castles and siege warfareWell documented
The connection
Masada sat on a desert mesa about 400 m (1,300 ft) above the Dead Sea, nearly impregnable. The Romans ringed it with a wall and camps, built a sloping ramp of earth and timber up a natural spur on the west, rolled up a tower with a ram, and broke in. A classic case of engineering beating natural defenses.
When and how
Masada, near the Dead Sea in today's Israel, AD 73 or 74; the Tenth Legion under Lucius Flavius Silva.
How we know
The ramp, siege wall and Roman camps are still visible; Yigael Yadin's excavations of 1963–1965 and later surveys examined them.
Debates and open questions
Some geologists argue the ramp was mostly a natural ridge and may never have been finished, so the final assault may differ from Josephus's account.
▸Battering ram and siege tower remained a key tool of Castles and siege warfareWell documented
The connection
Medieval armies still used rams under covered sheds, nicknamed 'cats' or 'sows', and wooden siege towers, much as the Assyrians had. Castle builders answered with moats, which kept machines away from the walls, and stronger gates. Cannon finally made rams obsolete in the 1400s.
When and how
Across medieval Europe and the Middle East; for example, crusaders used siege towers to take Jerusalem in 1099.
How we know
Medieval chronicles, illustrated manuscripts and engineering treatises describe rams and towers, and Roman manuals such as Vegetius's were widely copied.
Debates and open questions
How often rams actually broke walls is hard to measure; many sieges ended by starvation, treachery or negotiation without any breach.