Here, 'Britain' means forces from across the empire: Canadians, South Africans, Indians, Australians, and New Zealanders as well as personnel from the United Kingdom. The arrangement is described bluntly as a protection bargain in which Britain promised defence against outside powers in return for support. An attack on British interests in East Asia could therefore trigger a wider imperial mobilisation rather than a response confined to the Home Fleet. The formulation is deliberately compressed, but the imperial system explains why counting only forces based in Britain understates the coalition available in 1939.
Notable Point · 1:28:05-1:28:36
Why 'Britain' means an imperial coalition in 1939
The scenario's British response draws on imperial forces because the empire linked external protection to wartime support.