'Overthrow' in the Bible

But the princes of the children of Ammon said unto Hanun their lord, Thinkest thou that David doth honor thy father, in that he hath sent comforters unto thee? hath not David sent his servants unto thee to search the city, and to spy it out, and to overthrow it?

Then David said unto the messenger, Thus shalt thou say unto Joab, Let not this thing displease thee, for the sword devoureth one as well as another; make thy battle more strong against the city, and overthrow it: and encourage thou him.