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Why did castles and fortified cities give small medieval forces a military advantage?

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strategy Detail of the Bayeux Tapestry depicting an English soldier in combat with Norman cavalry during the Battle of Hastings, wool on linen, 11th-century; in the Bayeux Tapestry Museum, France.

Castles and fortified cities provided a significant military advantage to small forces by neutralizing the numerical superiority of attackers through defensive architecture and terrain management.

Stone fortifications were specifically designed to frustrate direct assaults. High walls prevented casual escalade, while features like machicolations and hoardings allowed defenders to drop missiles or substances on attackers from protected positions. Protruding towers enabled defenders to provide flanking fire along the wall's face, denying attackers an undisturbed approach.12

Strategic design elements further enhanced these defenses:
* Access Control: Entrances were few, small, and protected by barbicans, portcullises, and drawbridges, making surprise entry nearly impossible.12
* Terrain Utilization: Moats and precipitous hill sites forced attackers to contend with difficult terrain, often while under defensive fire.12
* Sustainability: Keeps were equipped with wells and provisions, allowing a small garrison to endure long sieges.2

Because these defenses were so effective, sieges were more frequently resolved by starvation, disease, or treachery than by direct military breach.13