2 Chronicles 13:17 Commentary - English Annotations on the Holy Bible by Matthew Poole
A vast number: but it hath been oft observed and recorded by sacred and profane historians, that in those ancient times there were very numerous armies, and ofttimes very great slaughters; and if this slaughter was more than ordinary, there is nothing strange nor incredible, because the Almighty God fought against the Israelites.
Consult other comments:
2 Chronicles 13:17 - Albert Barnes' Notes on the Bible
2 Chronicles 13:17 - The Cambridge Bible for Schools and Colleges
2 Chronicles 13:17 - Adam Clarke's Commentary and Critical Notes on the Bible
2 Chronicles 13:17 - Ellicott's Commentary for English Readers (Old and New Testaments)
2 Chronicles 13:17 - John Gill's Exposition of the Entire Bible
2 Chronicles 13:17 - English Annotations on the Holy Bible by Matthew Poole
2 Chronicles 13:17 - Scofield Reference Bible Notes
2 Chronicles 13:17 - John Trapp's Complete Commentary (Old and New Testaments)
2 Chronicles 13:17 - The Treasury of Scripture Knowledge
2 Chronicles 13:17 - Whedon's Commentary on the Old and New Testaments
English Annotations on the Holy Bible by Matthew Poole

Matthew Poole (1624–1679) wrote English Annotations on the Holy Bible, completing the chapters as far as Isaiah 58 before his death in 1679. The rest of the Annotations were completed by friends and colleagues among his Nonconformist brethren. The first printing of the completed edition was in 1685, 2 volumes folio, followed by editions in 1688, 1696 (with valuable chapter outlines added by the editors, Samuel Clark and Edward Veale), and the 4th and definitive edition in 1700, the basis of all others.