Is The Book "Shogun" Historically Accurate

With the upcoming Shogun series, I decided to tackle the question of Shogun's historical accuracy. It's a question I'm often asked. Hope you enjoy the answer.
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[@erinrising2799]

My issue was when Anjin looked around for a life jacket, when they weren't invented until the mid 1800s

[@WaltMussell]

I don't remember that in the book, but I wonder if he was looking for something to throw that would float