'Defend' in the Bible

pick the best and most capable of your master's sons, place him on his father's throne, and defend your master's dynasty."

"Here's what we'll do: A third of you will enter here on this coming Sabbath dressed as guardians of the watch for the king's palace, with a third of you at the Sur gate, and a third at the gate behind the guards. Keep watch over the palace and defend it.

For I will defend this city, to save it, for mine own sake, and for my servant David's sake.

And I will add unto thy days fifteen years; and I will deliver thee and this city out of the hand of the king of Assyria; and I will defend this city for mine own sake, and for my servant David's sake.