I finally decided to start with Shogun 2 Total War. I have all DLC except blood DLC but I am more interested in Fall of the Samurai, being strongly interested in the history of late 19th century, known as victorian era. So I started with the tutorials but I don't know anything about the periods of history covered in this game, including Shogun 2 base game and Shogun 2 Fall of the Samurai DLC. How can I learn about the context of Shogun 2?