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Up next, yours truly on Cog #shipping becoming Crusades artillery... Tweets c/o PK from @Medievalists and @MedWarMag here @KzooICMS #kzoo2019 
Long history of adapting ships to siege machines but the crusades inspired new methods
By the 13th century crusader ships served as military fighting platforms
1168 - conquest of Riga done exclusively by cog - afterwards other crusaders make use of this kind of ship
Crusader cogs dominate siege warfare - ie Siege of Acre in the 3rd Crusade
Cogs could be transformed and rebuilt into siege machines and bridges
Crusaders modified their cogs in so many configurations it would lead to failures of design
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