Why solitary medieval WATCHTOWERS were so rare

Different to castles and fortresses, the military watchtower is a smaller military outpost and often depicted in strategy videos games and movies but what if they didn't exist in medieval times? Why were castles invented:    • How and why CASTLES were invented   The Machicolations shirt and others: teespring.com/stores/shadiversity Shadiversity on Patreon: www.patreon.com/shadiversity Background Music, Castle, By Kevin Macleod

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