One genealogical record that matches in all respects known details of my family shows that Hermanus Egbert Pieter Kotze died at the English Hospital at Elandsfontein on 01/04/1902:
Birth: circa 1877
Death: April 01, 1902 (20-29)
Elandsfontein, Heidelberg, Transvaal, South Africa
Immediate Family: Son of Theunis Johannes Kotze and Maria Elisabeth de Beer
Husband of Christina Wilhelmina Gertruida Kotze
Father of Theunis Johannes Kotze and Christina Wilhelmina Gertruida Kotze
Brother of Samuel Jacobus Kotze; Theunis Johannes Kotze; Hilletje Hendrika Maria Kotze and Matthys Johannes Marthinus Kotze
The family story is that Hermanus was in a laager that was surprised at night by a British force accompanied by betrayers. When Hermanus tried to ride out of the attack he was wounded and ended up in an English hospital, where he died before his wife could get to see him.
If that story is right and I have no reason to doubt the basic facts, then the action nearest to it in time and location is the attack by the 2nd Queens Dragoons on the night of 31 March/01 April on a farm at Holspruit or Steenkoolspruit, which went awry when it found itself in contact with a large Boer force under General Alberts. It is vividly described by a Major Vaughan (later Maj Gen) the Dragoons in his account here:
Vaughan's account fits well with the family history: night attack and the British force accompanied by National Scouts, prisoners taken.
Finally, there is an entry in the Transvaal State Archives section on the SA National Archives that shows a compensation claim dating to 1902 by Christina Willhelmina Gertruida Kotzee (born Mienie) the surviving spouse of Hermanus Egbert Pieter Kotzee.
DESCRIPTION KOTZEE, HERMANUS EGBERT PIETER.
REMARKS SURVIVING SPOUSE CHRISTINA WILHELMINA GERTRUIDA KOTZEE (BORN MIENIE).
I would dearly love to find out anything about this bittereinder ancestor who seems to have died within a fortnight of the start of the peace negotiations in the middle of April 1902.