Son of John Koch Siebert, of Swellendam, Cape Province. Initially served in the Southern Rifles, which was one of the smaller units taking part in the German SWA campaign.In Nov 1916 he attested as Fireman in the SA Railways Overseas Dominion Section. He suffered shell wounds in the face on 6 Aug 1917 and died of wounds two days later in No. 2 Canadian Casualty Clearing Station. On Mossel Bay War Memorial, Western Cape