'Shield' in the Bible

They prepare the table. They set the watch. They eat. They drink. Rise up, you princes, oil the shield!

Elam carried his quiver, with chariots of men and horsemen; and Kir uncovered the shield.

Therefore thus says Yahweh concerning the king of Assyria, 'He will not come to this city, nor shoot an arrow there, neither will he come before it with shield, nor cast up a mound against it.