Military strength is required to rule over the kingdom but not to misuse them for aggression to others' country or others' kingdom. That was not allowed. So when Kṛṣṇa appeared, there were many kings. Although they were under the ruling of the Pāṇḍavas, still, Hastināpura, still they were fighting. That is natural. If one has no Kṛṣṇa consciousness, then his strength and opulence would be misused. And if one is Kṛṣṇa conscious, then he would use his strength and opulence very properly.