There are not many colonial heroes in Australia's frontier wars, but some emerged after the unprovoked 1838 massacre of at least 28 Wirrayaraay people in northern NSW. They ensured that the perpetrators were identified, and prosecuted.

Guest: Mark Tedeschi KC, author of ‘Murder at Myall Creek: the trial that defined a nation’ (Simon & Schuster, 2016)  Producer: Ann Arnold