Yep... Me again.
Do you have the basics? If not, here they are…
1889: Major General John Davis, CB. Commanding Dublin District. Ensign Feb 52. Lieut 20 June 54. Capt 16 Sept 59. Maj 21 Aug 66. Lt Col 15 Feb 68. Col. 15 Feb 73. Maj Gen Aug 83.
35th Royal Sussex 1852. Not sure where he is after that in the age of purchase until 1866.
Half pay major 37th foot (placed on half pay 25th May 66!) Lt. Col. of 37th until promoted to colonel. Half pay Lt Col from 25 Sept 1872 (still 37th).
1874-76 Lt. Col. 20th Foot (East Devonshire). Not sure if the colonel rank is brevet or substantive as he is listed a colonel outside his regiment but at a Lt. Col. within. According to Hart’s 1876 & 1880 he was placed on half pay 14th May 1873, and again on 9th June 1880; and is listed a Lt. Col. on the regimental list (20th Foot) throughout, but as a colonel on the colonel list.
1881 no-longer listed with regiment.
Davis served with the 35th Regiment in the Shahabad district during the Indian Mutiny campaign in 1858-59 (Medal).
General Sir John Davis, KCB (1832-1901), commanded the troops at Malta (1884-1887), in command of the Dublin District (1887-1890), and of the Southern Regimental District (1893-1898)"
(from Wikipedia) – they ref: "Obituary - General Sir John Davis" The Times (London). Monday, 7 October 1901. (36579), p. 4.
From The Hampshire Advertiser (Southampton, England), Wednesday, August 08, 1883:
Colonel the Hon. Ernerst Curzon is about to be appointed to the command of the troops at Shorncliff, in the room of Colonel Davis, who shortly vacates the appointment on promotion to the rank of Major-General."
From The Standard (London, England), Tuesday, July 15, 1884:
Major General J. Davis, C.B., has relinquished command of the 2nd Brigade of the Army of Occupation at Abbasseyeh, and assumed that of the 1st Brigade at Cairo."
The Standard (London, England), Wednesday, November 04, 1885:
Major General J. Davis, who has been acting as Chief of the Staff in Egypt, has handed over that position to Major General Lyon-Fremantle, who has accepted the appointment."
I hope that is of some help,