The pledge of support by France and Great Britain to Poland on 31 March 1939 is reminiscent of earlier alliances and guarantees made in the lead-up to major conflicts, particularly World War I. Specifically, it parallels the ententes and alliances established to counter German aggression, such as the Triple Entente of France, Russia, and Great Britain, which aimed to contain the Austro-German alliance.
Moreover, this pledge can also be compared to the guarantees provided by various nations during the interwar period to deter aggressor states, similar to the Munich Agreement of 1938, where Britain and France attempted to appease Adolf Hitler by allowing the annexation of the Sudetenland in Czechoslovakia, which ultimately failed to prevent further aggression.
In essence, the March 1939 pledge demonstrates a strategic response to the growing threat of Nazi Germany, reflecting historical patterns of alliances and diplomatic commitments intended to deter aggression and maintain peace in Europe.