"Freedom on the Wallaby
Henry Lawson's well known poem, Freedom on the Wallaby, was written as a comment on the 1891 Australian shearers' strike and published by William Lane in the Worker in Brisbane, May 16, 1891.

The last two stanzas of the poem were read out by Frederick Brentnall MP on July 15, 1891 in the Queensland Legislative Council during a 'Vote of Thanks' to the armed police who broke up the Barcaldine strike camp. There were calls in the chamber for Lawson's arrest for sedition. Lawson wrote a bitter rejoinder to Brentnall, The Vote of Thanks Debate.

The "Rebel flag" referred to in the poem is the Eureka Flag that was first raised at the Eureka Stockade in 1854, above the Shearers' strike camp in 1891 and carried on the first Australian May Day march in Barcaldine on May 1, 1891."

That's from Answers.com