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Keelhauling represent a method of punishment or execution, once practiced out to sailors at sea. Every pirate and Navy sailor feared the most horrific, brutal and sadistic torture technique that ever existed in the Age of Sail.
Flogging is method of punishment by beating the human body with particular implements such as lashes, whips, switches, rods, etc. Flogging was one of the most common punishments Navy sailors from many countries received during the Age of Sail. Since many of the pirates served in the Navy, they tended to avoid flogging as punishment during their pirate service.
Blackbeard is without the doubt one of the most popular pirates of all time, and because of that his life and exploits were put under largest spotlight throughout the history. Here you can find many interesting facts about Blackbeard.
Article that covers duties aboard and describes chain of command used on most pirate ships.