2 Chronicles 13:3 - Albert Barnes' Notes on the Bible

It has been proposed to change the numbers, here and in 2 Chronicles 13:17, into 40,000, 80,000, and 50,000 respectively - partly because these smaller numbers are found in many early editions of the Vulgate, but mainly because the larger ones are thought to be incredible. The numbers accord well, however, with the census of the people taken in the reign of David 1 Chronicles 21:5, joined to the fact which the writer has related 2 Chronicles 11:13-17, of a considerable subsequent emigration from the northern kingdom into the southern one. The total adult male population at the time of the census was 1,570, 000. The total of the fighting men now is 1,200, 000. This would allow for the aged and infirm 370, 000, or nearly a fourth of the whole. And in 2 Chronicles 13:17, our author may be understood to mean that this was the entire Israelite loss in the course of the war, which probably continued through the whole reign of Abijah.