From: Jagersfontein
This Prisoner of War record for Guillaume Jacobus Oberholzer was transcribed record from various documents held at the National Archives, South Africa, including arrest and shipping information from newspaper sources like De Zuid-Afrikaan.
https://www.gendatabase.com/boer-war-prisoner-record.php?q=5196&r=Guillaume Jacobus&s=Oberholzer&ref=
This set of Prisoner of War documents can be accessed online via the FamilySearch.org project by Clicking Here.