The Salonika Campaign was perhaps the most diverse of the First World War. By 1917, the Allies fielded 600,000 men in six national contingents: British, French, Greek, Italian, Russian and Serbian. Within the British and French forces were units from India, Indo-China, North and West Africa. At peak strength the British Salonika Force (BSF) numbered more than 228,000 officers and men. The British employed volunteer units such as a Mule Corps and the Maltese Labour Corps. Australian, Canadian and New Zealand medical personnel were also part of the BSF and the volunteer Scottish Women’s Hospital had units attached to the Serbian army.