The case in courtroom 18D: Ben Roberts-Smith defamation case set for momentous 12-week trial

The consequences are acutely personal for one of Australia's most decorated soldiers, who will take the stand as the very first witness

In the quiet formality of court 18D of Sydney's federal court, one of the most decorated soldiers in the history of Australia's military will this week swear an oath, sit in the witness box, and begin giving evidence about what he saw and did during the war in Afghanistan.

Ben Roberts-Smith, the former SAS corporal and recipient of both the Victoria Cross and Medal for Gallantry, begins defamation proceedings against three Australian newspapers on Monday.