A 450 year old book called “The Hundred Rules of War” is a series of songs about the life and rules of being a Samurai. It discusses names for young Samurai to be, to what foods should be eaten,etc. The book was written by a famous samurai named Tsukahara Bokuden, who lived from 1489 to 1571, during a war-ridden time in Japan. Stories told about Bokuden claim that he fought in over 100 battles and slew hundreds of swordsmen.
The translator of the English version is Eric Shahan who specializes in Japanese martial arts. Also in the book it states that short horses are easier to control and easier to ride. If you ride a small horse, you are not very intelligent Samurai. It is an interesting read for those who are interested in martial arts and Japanese culture. The work is available at Amazon for $18.