My great great uncle Trooper John Tenniswood appears on the roll of Steinaeckers Horse from 1902 to the units disbandment in 1903. I think he joined them after the Yorkshire Regt left SA. The Yorkshire Regiment served for a time with Steinaeckers horse on some mission.
I have later learned that he served in several units and might have no connection with the Yorkshire Regt
Bill Woolmore's book 'Steinaecker's Horsemen' has a 10-line entry for John Tenniswood. There are details of his service during the Boer War in three Colonial units. If you do not have this information, I will copy it and post it later.