'War' in the Bible

Thus says Yahweh concerning the prophets who lead my people astray; for those who feed their teeth, they proclaim, "Peace!" and whoever doesn't provide for their mouths, they prepare war against him:

and he will judge between many peoples, and will decide concerning strong nations afar off. They will beat their swords into plowshares, and their spears into pruning hooks. Nation will not lift up sword against nation, neither will they learn war any more.