Charles Cornwallis Marquis Cornwallis. Correspondence of Charles, First Marquis Cornwallis. 3 vols., 2nd ed. 1859. :

Vol. 2: 1798 Ireland: Chapter XIX: pp. 339-462:
https://books.google.com/books?id=F3lmAAAAMAAJ&pg=PA339

Vol. 3 also covers Ireland, but after the Rebellion.