A by-election was held for the New South Wales Legislative Assembly electorate of Cumberland South Riding on 12 June 1856 because William Manning resigned in May 1857 due to ill-health. Dates Result William Manning resigned on account of ill-health. See also Electoral results for the district of Cumberland (South Riding) List of New South Wales state by-elections References 1857 elections in Australia New South Wales state by-elections 1850s in New South Wales