When the United Kingdom declared war on Germany at the start of World War I in August 1914, settler society in Southern Rhodesia, then administered by the British South Africa Company, received the news with great patriotic enthusiasm. The Company administrator, Sir William Milton, wired the UK government, "All Rhodesia ... ready to do its duty". Although it supported Britain, the Company was concerned about the possible financial implications for its chartered territory should it make direct commitments to the war effort, particularly at first, so most of the colony's contribution to the war was made by Southern Rhodesians individually—not only those who volunteered to fight abroad, but also those who remained at home and raised funds to donate food, equipment and other supplies.
Starting immediately after the outbreak of war, parties of white Southern Rhodesians paid their own way to England to join the British Army. Most Southern Rhodesians who served in the war enlisted in this way and fought on the Western Front, taking part in many of the major battles with an assortment of British, South African and other colonial units, most commonly the King's Royal Rifle Corps, which recruited hundreds of men from the colony, and created homogenous Rhodesian platoons. Troopers from Southern Rhodesia became renowned on the Western Front for their marksmanship, a result of their frontier lifestyle. Some of the colony's men served in the Royal Flying Corps, one of the two predecessors of the Royal Air Force. The Rhodesia Regiment, the Rhodesia Native Regiment and the British South Africa Police served in the African theatre of the conflict, contributing to the South-West African and East African campaigns.