Chronicles II 13:3

3 And Abia set the battle in array with an army, with mighty men of war, four hundred thousand mighty men: and Jeroboam set the battle in array against him with eight hundred thousand, mighty warriors of the host.

Chronicles II 13:3 Meaning and Commentary

2 Chronicles 13:3

And Abijah set the battle in array, with an army of valiant man
of war, even four hundred thousand chosen men
Collected such an army of select men, led them into his enemy's country, and set them in order of battle:

and Jeroboam also set the battle in array against him, with eight
hundred thousand chosen men, being mighty men of valour;
double the number of Abijah s army, he having ten tribes to collect out of, and Abijah but two.

Chronicles II 13:3 In-Context

1 In the eighteenth year of the reign of Jeroboam Abia began to reign over Juda.
2 He reigned three years in Jerusalem. And his mother's name Maacha, daughter of Uriel of Gabaon. And there was war between Abia and Jeroboam.
3 And Abia set the battle in array with an army, with mighty men of war, four hundred thousand mighty men: and Jeroboam set the battle in array against him with eight hundred thousand, mighty warriors of the host.
4 And Abia rose up from the mount Somoron, which is in mount Ephraim, and said, Hear ye, Jeroboam, and all Israel:
5 not for you to know that the Lord God of Israel has given a king over Israel for ever to David, and to his sons, by a covenant of salt?

The Brenton translation of the Septuagint is in the public domain.