And there went out after him Joab's men
Who though he was removed from his post as general, yet might still have the command of a regiment:
and all the mighty men;
the military men that were at Jerusalem as many as could be spared:
and they went out of Jerusalem to pursue after Sheba the son of Bichri;
with Abishai at the head of them; Josephus F17 says there were six hundred, besides the soldiers at Jerusalem that went on this pursuit.
F17 Antiqu. l. 7. c. 11. sect. 7.