Hello Ian
Sorry for the late reply - I seem to have stopped getting notifications (maybe because I haven't logged in for a little while!)
The Thomas Wild you have on the medal roll there belongs to the 4th Bttn. Rifle Brigade, so I don't think he's your man. There is a 'Sgt T. Wilde (983)' on the Royal Artillery medal roll, who I think is recorded as being with E/B RHA, but it's not entirely clear which battery he was with. It may not be E/B, as they did not enter the campaign until March 1880, and then it was in the south of the country (Jellalabad being north, on the other side of the Khyber, en-route to Kabul).
No death is recorded in his notes (it usually is) but there's an 'E' number - and if I remember correctly that might refer to 'effects' - as in personal effects left after death. It would be nice to have something more substantial!
There was no 1/5 RA in the Afghan War, so he may have been attached to another battery - and that might also fit the unclear battery listing on the above medal roll extract. Having said that, L/5 RA did serve, and they were in the Khyber region in early 1880 (there's no Wilde listed on the L/5 medal roll), but I'm not sure if it was as early as Jan (needs a bit more time to look into).
The chances are that he died from disease (most likely cholera) at Jellalabad, so he won't be on a casualty list and it wouldn't coincide with any action, of course.
Just a few bits for now! Best -
Garen