2 Chronicles 20:9 Commentary - English Annotations on the Holy Bible by Matthew Poole
The sword, judgment, or rather, the sword of judgment, or of vengeance, i.e. war, whereby thou judgest and punishest thy people for their sins. Compare Lev 26:25.
Consult other comments:
2 Chronicles 20:9 - The Cambridge Bible for Schools and Colleges
2 Chronicles 20:9 - Adam Clarke's Commentary and Critical Notes on the Bible
2 Chronicles 20:9 - Companion Bible Notes, Appendices and Graphics
2 Chronicles 20:9 - Ellicott's Commentary for English Readers (Old and New Testaments)
2 Chronicles 20:9 - Geneva Bible Notes
2 Chronicles 20:9 - John Gill's Exposition of the Entire Bible
2 Chronicles 20:9 - English Annotations on the Holy Bible by Matthew Poole
2 Chronicles 20:9 - John Trapp's Complete Commentary (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.