From: Vlakfontein
This Prisoner of War record for Johannes Jacobus Frederik P Britz 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=15535&r=Johannes Jacobus Frederik P&s=Britz&ref=
This set of Prisoner of War documents can be accessed online via the FamilySearch.org project by Clicking Here.