The Coo-ee March was a significant World War I recruitment march that began in Gilgandra, New South Wales, Australia, in October 1915. Led by William Thomas Hitchen, the march covered 515 kilometers to Sydney, attracting volunteers along the way with the rallying cry "Coo-ee!" This iconic event bolstered enlistment efforts and remains a poignant symbol of Australian patriotism and camaraderie.