From: Droogefontein
This Prisoner of War record for Johannes Gert Elias Duvenage 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=3661&r=Johannes Gert Elias&s=Duvenage&ref=
This set of Prisoner of War documents can be accessed online via the FamilySearch.org project by Clicking Here.