How did the principles of warfare change under the daimyos?
a. The rise of gunpowder and cannon made the fortresses and castles of the warrior elite obsolete.
b. Warfare based on spying, timely assaults, wise command, and organization of massive armies replaced heroic combat.
c. Peasant forces were reduced in significance, as they were replaced by professional soldiers.
d. Heroic combat between champions remained the rule, but the weapon of choice changed from the bow to the curved sword.
e. They introduced new military techniques and strategies learned from contacts with Islamic traders.
Answer: B