The Thirty-ninth marched from Castlebar to Dublin in August 1820, and arrived at its destination on the 17th of that month.

1821.

In March 1821, the regiment was removed from Dublin to Cork.

On the 24th of August 1821, the establishment of the regiment was reduced from ten to eight companies, of three serjeants and seventy-two rank and file each; and on the 26th of November it marched from Cork to Tralee.

1822.

In January 1822, some detachments of the regiment were employed in suppressing a partial insurrection of the Whiteboys. Brevet-Major George D’Arcy was attacked at Millstreet, in the county of Cork, and beat off considerable bodies of the insurgents. Brevet-Major Charles Carthew was also engaged with a large body of them near Bantry, when one private of the regiment was killed.

1823.

The regiment marched, on the 1st of October 1823, from Tralee to Limerick.

Lieut.-General Sir George Airey, K.C.H., was appointed colonel of the Thirty-ninth regiment on the 28th of October 1823, in succession to General Nisbett Balfour, deceased.

1824.