I am unable to find his service record but have found the following, no mention of the Zulu War of 1879.
Hartley Edmund Colonel Born May 6, 1847; is son of Dr Edmund Hartley, of S Devon, and was educated privately at Plymouth. He joined the CMR November 4, 1877; served through the Gaika-Galcka and Marotsi rebellions, 1877-8-9 medal); Basuto and Tembuland, 1880-1; Langberg, 1897 (medal and three clasps); and the Boer War (QSA, three clasps, and KSA, two clasps). Colonel Hartley commands the Cape Med. Corps, and is PMO of the Cape Colony Forces. He married Ellen, 2nd daughter of J Rose-Innes, CMG, late Under-Secretary for native Affairs.