Britain’s wartime history is often told through familiar images: soldiers in the trenches, Spitfires above southern England and naval escorts battling across the Atlantic. Yet those images tell only part of the story. Britain’s ability to endure two world wars depended heavily on people from across the British Empire and Commonwealth.
They fought on land, served at sea, flew combat missions, treated the wounded and sustained the supply lines on which entire campaigns depended. Their contribution deserves a central place in British remembrance. It also offers a lesson for the future: Britain’s security has long depended on partnerships reaching far beyond its shores.
If Britain ever faced another global war, Commonwealth partners could again make a vital difference. That possibility, however, must be understood through the realities of modern sovereignty and mutual obligation.
The First World War: a worldwide contribution
During the First World War, more than three million soldiers and labourers from across the Empire and Commonwealth served alongside the British Army. Their service stretched from the Western Front to Africa and the Middle East. Indian troops fought in France and Belgium, while African soldiers helped contain German forces in East Africa and defeat them in West Africa. Caribbean servicemen served in theatres including France, Italy, Africa and the Middle East. These were substantial contributions to a global war effort. National Army Museum
Australian and New Zealand troops became inseparable from the memory of Gallipoli. The landings of April 1915 brought them into a costly campaign alongside British, French and other Allied forces. Australians subsequently fought on the Western Front and in the Middle East, carrying a burden of casualties that profoundly affected communities at home. Australian War Memorial
The terminology needs care. The modern Commonwealth did not yet exist in its present form. These forces came from self-governing dominions and colonies with very different relationships to Britain. The association of independent, equal Commonwealth members developed later, with the London Declaration of 1949 marking a defining change. Commonwealth history
Remembering their service therefore means recognising both individual courage and the imperial system within which they served. It should also mean remembering the labourers and support personnel whose work made military operations possible, even when their names received little public attention.
The Second World War: the strength behind Britain’s resistance
The same international dependence was evident during the Second World War.
Around 2.5 million men served in the British Indian Army. Their service included campaigns far from home as well as the defence of India against Japanese invasion. This immense mobilisation took place while India remained under British rule and its independence movement gathered strength. Military service and demands for self-government existed alongside one another. National Army Museum
Canada’s contribution was equally significant. More than 1.1 million Canadian men and women served in its armed forces. Canadians fought in Italy, landed in Normandy and helped liberate the Netherlands. At sea, Canadian naval and merchant service was central to the struggle to keep Atlantic supply routes open. Those routes connected Britain to the food, fuel and equipment needed to continue fighting. Veterans Affairs Canada: Second World War, Battle of the Atlantic
Britain’s air defence also depended on people from overseas. The RAF Museum records that one fifth of Fighter Command’s aircrew during the Battle of Britain came from abroad, representing 16 nations. Commonwealth pilots served alongside other overseas airmen, including those from occupied European countries. Even this most recognisably British battle was an international effort. RAF Museum
Other contributions deserve the same attention. West African troops took part in the Allied counter-offensive in Burma. New Zealand’s 28th Māori Battalion fought in Greece, North Africa and Italy. Australian aircrew served across the Mediterranean, Europe and Britain’s sea lanes. The geographical reach of these forces helped Britain and its allies sustain campaigns across several continents. National Army Museum, UK Government historical overview
Britain should remember these men and women as people with families, ambitions and national histories of their own. Their service belongs within Britain’s story, and within the stories of their own countries.
What would Commonwealth support mean in a future world war?
A third world war is a hypothetical catastrophe, and preventing it must remain the priority. There is also no single scenario that can tell us which countries would participate, where fighting would occur or what assistance Britain would receive.
Nevertheless, the historical lesson is clear: sustaining a major war requires more than the forces a country can deploy at its outset.
Commonwealth partners could contribute trained personnel, naval and air forces, intelligence, transport, maintenance, industrial production and medical support. Assistance protecting trade routes or maintaining supplies could be as consequential as troops deployed directly alongside British units. These are plausible forms of cooperation, rather than predictions or existing commitments across the Commonwealth.
Some foundations already exist. Britain, Canada, Australia and New Zealand participate with the United States in the Five Eyes intelligence partnership. Britain and Australia also cooperate with the United States through AUKUS. Separately, the Five Power Defence Arrangements connect Britain with Australia, Malaysia, New Zealand and Singapore. These arrangements have different purposes and should not be treated as interchangeable guarantees of wartime support. Australian Parliament, UK National Security Strategy 2025
Canada’s relationship with Britain also sits within NATO. For an armed attack covered by the North Atlantic Treaty, Article 5 creates an obligation to assist, although each ally determines the action it considers necessary. Commonwealth membership itself creates no equivalent collective-defence guarantee. NATO
Partnership must be earned and reciprocated
Today’s Commonwealth is a voluntary association of independent and equal countries, each responsible for its own policies. Britain cannot assume that shared history would produce a common decision to enter a future war. Commonwealth Charter
Every government would have to consider its own people, security, resources and understanding of the conflict. A worldwide emergency could also place partners under simultaneous pressure in different regions, limiting the help they could offer Britain.
For that reason, the practical work of partnership must happen in peacetime. Joint training, compatible equipment, secure communications and reliable supply arrangements can make cooperation more effective when a crisis arrives. Diplomatic trust matters just as much. Britain must be prepared to take its partners’ security concerns seriously and offer meaningful assistance in return.
Commonwealth cooperation would also form part of a wider coalition. Britain’s relationships with European allies, the United States and other international partners would remain essential.
The service of earlier generations gives Britain a responsibility to remember accurately and treat present-day partners with respect. It creates no entitlement to another generation’s sacrifice.
Across two world wars, people from across the Empire and Commonwealth helped sustain Britain through extraordinary danger. Their courage should remain part of our national memory. The strongest way to honour that inheritance is to build equal, dependable partnerships today—relationships capable of defending peace and supporting one another if peace fails.
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