Did the Chinese teach younger people warfare and how?

The Chinese taught younger people warfare by a book called The Art of War written more then 2,500 years ago.  it was written by a man named Sun-tzu, a great Chinese general from the Warring States Era.  In this awesome book they tell how good a warrior should be.  An example from the book is that it says, " a soldiers spirit is keenest in the morning".  Another thing is that is said, " those who are are not thoroughly aware of their disadvantages are not aware of their enemies disadvantages."