'Fight' in the Bible

Joab's brother Abishai was the lieutenant in charge of the platoons. He used his spear to fight and kill 300 men, gaining a reputation distinct from the Three.

So David received them and assigned them to be officers over troops. Some of the descendants of Manasseh joined David when he was going to fight against Saul, accompanied by the Philistines. Even so, David was of no help to them, because the Philistine rulers were counseled to send him away. They told themselves, "He's going to go over to his master Saul at the cost of our heads."

When the Philistines learned that David had been anointed king over all of Israel, all of the Philistines invaded to look for David. David heard about it and went out to fight them.

Later the next spring, at the time that kings go out to fight, Joab led out the army, ravaged the territory of the Ammonites, and then went out and attacked Rabbah, while David remained behind in Jerusalem. Joab besieged Rabbah and conquered it.