Insanely cautious, and believes in stacking the deck in his favour.
Won't attack until completely sure to win in a "fair right", and presents a façade to the world that under reports his true ability, so that he is completely under estimated, resulting in their attacks and defenses not being at max.
Both sides have the opinion that you should not expend more effort than needed, it's just that he doesn't consider effort expended in training as ever being unjustified.
The more effort put into training, the less effort required in combat, therefor, train for as long as you can prior to engaging in combat.
Result: minimum casualties on his side while achieving victory.