Post WWI, many Australian and British veterans took up parcels of land to farm in remote regions of Western Australia. When the Great Depression hit in 1929 farmers were encouraged to plant more wheat, with the promise of government subsidies (which never came). Inland drought and annual migration bought wildlife to the grain rich paddocks and livestock soaks of marginal farming land around Campion and Walgoolan.
Some of the older people in WA still recall the emergency in the second half of 1932: a wildlife plague that reached such desperate levels that troops were were called to (f)arms, under Major G.P.W. Meredith of the Seventh Heavy Battery of the Royal Australian Artillery, Sergeant S. McMurray, and Gunner J. O'Halloran. Settlers familiar with war requested Lewis automatic machine guns to brace themselves against the tide of 20,000 ravenous Murchison yallabiddies (more commonly known as the humble emu).