'Man of War' in the Bible

Then answered one of the servants, and said, Behold, I have seen a son of Jesse the Bethlehemite, that is cunning in playing, and a mighty valiant man, and a man of war, and prudent in matters, and a comely person, and the LORD is with him.

And Saul said to David, Thou art not able to go against this Philistine to fight with him: for thou art but a youth, and he a man of war from his youth.

And David said to Abner, Are you not a man of war? is there any other like you in Israel? why then have you not kept watch over your lord the king? for one of the people came in to put the king your lord to death.