The men of Judah served as heavy-armed troops, while the Benjamites were light-armed. Their numbers accord well with those of 2 Chronicles 13:3. As the boundaries of Judah had been enlarged 2 Chronicles 13:19, and as for ten years at least there had been no war 2 Chronicles 14:1, the effective force had naturally increased. It was 400, 000; it is now 580, 000.
Related Commentaries of 2 Chronicles 14:8
2 Chronicles 14:8
8 And Asa had an army of men that bare targets and spears, out of Judah three hundred thousand; and out of Benjamin, that bare shields and drew bows, two hundred and fourscore thousand: all these were mighty men of valour.