Yam made the battle both sides set to separate multiple-year protracted to finish one day! If he was wrongful-minded position and money does not use a spy until he makes may not understand the nature of the enemy to defeat.
When the two sides fight a protracted war years. In order to conquer the finish in one day. If greedy for gold and silver Not a spy So do not understand the state of the enemy must be defeated.
During the war, both sides face lasting several years. In order to conquer in a single day. If the parsimonious position and wealth, not using the spy. That may not understand the condition of the enemy to be defeated!