The kings being of softer education, and less experienced in military matters, were less fit for his service; and being many of them but mercenaries, and therefore less concerned in his good success, would be more negligent and cautious in venturing themselves for his good. Captains, i.e. experienced soldiers of his own subjects, who will faithfully obey the commands of the general, (to which the kings would not so readily yield,) and use their utmost skill and valour for their own interest and advancement.
Related Commentaries of 1 Kings 20:24
1 Kings 20:24
24 And do this thing, Take the kings away, every man out of his place, and put captains in their rooms: