Ex-soldier lost case against three newspapers in June with trial judge finding they had proven on the balance of probabilities that Roberts-Smith murdered unarmed civilians in Afghanistan

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Ben Roberts-Smith has launched an appeal after he lost his war crimes defamation trial in the federal court.

Justice Anthony Besanko found in June that three newspapers had proven Roberts-Smith had, on the balance of probabilities, murdered unarmed civilians while serving in the Australian military in Afghanistan.