Ireland returned to his brigade on June 6, 1864, and served until his health gave out on September 9. Thus he was back in command at the crossing of Peachtree Creak on July 19, 1864; 269-270. and he led the brigade at Battle of Peachtree Creek, in which Col. Cobham was killed. After leading his brigade into Atlanta on Sep. 2, 1864, Ireland fell ill with dysentery, dying on September 10. His passing was noted with regret by Maj. Gen. Geary in his report on the Atlanta Campaign. Col. Ireland's fellow officers, meeting on September 10, expressed their regret for "his untimely death, as it were, "On the field of his fame and glory".