Then he sent them out in three groups, with Joab and Joab's brother Abishai and Ittai from Gath, each in command of a group. And the king said to his men, “I will go with you myself.”
My advice is that you bring all the Israelites together from one end of the country to the other, as many as the grains of sand on the seashore, and that you lead them personally in battle.
But Abishai son of Zeruiah came to David's help, attacked the giant, and killed him. Then David's men made David promise that he would never again go out with them to battle. “You are the hope of Israel, and we don't want to lose you,” they said.
Joab's brother Abishai (their mother was Zeruiah) was the leader of “The Famous Thirty.” He fought with his spear against three hundred men and killed them, and became famous among “The Thirty.”
Joab heard what had happened. (He had supported Adonijah, but not Absalom.) So he fled to the Tent of the Lord's presence and took hold of the corners of the altar.
Gideon and his one hundred men came to the edge of the camp a while before midnight, just after the guard had been changed. Then they blew the trumpets and broke the jars they were holding,
so he took his men, divided them into three groups, and hid in the fields, waiting. When he saw the people coming out of the city, he came out of hiding to kill them.
That night Saul divided his men into three groups, and at dawn the next day they rushed into the enemy camp and attacked the Ammonites. By noon they had slaughtered them. The survivors scattered, each man running off by himself.