The art of war gives us a technique, methods or ways that how to think before entering in to the battle field? How to act when you are in battle field and facing your enemy campaign? How to prepare your army from beginning? And how to counter the attack? Either they are in superior or inferior position! And the are of war give us a basic knowledge about natural things like ,types of grounds, like dispersive, facial, contentious etc grounds and 5 fundamental strategy's which are measurement, estimation of quantity, calculation, balancing and victory While in any field of battle moral law and discipline play key role to achieving victory and the best thing where I felt so fantastic from art of war was it's not important that you are knows all the fundamental things about your land, your army and the strategy but knowing all this of enemy is more important than knowing your own! And calculate more! Those who calculate more will be victories according to sun tzu and use spy for check and balance of enemy moves !!!!