Final answer:
Britain did not form an alliance with Italy in WWII; instead, under Churchill, it rejected Mussolini's truce offer and stood against the Axis Powers, with significant campaigns in North Africa and Italy before liberating France.
Step-by-step explanation:
The question pertains to the historical events surrounding Britain's involvement in World War II and its strategic decisions in the face of the Axis Powers' expansion. Contrary to the initial statement in the question, Britain did not enter an alliance with Italy during World War II to stop Hitler. Instead, Britain stood alone post-Dunkirk evacuation, considering the offers for a truce from Mussolini but ultimately rejecting them under Winston Churchill's leadership. The country had almost no defense on land but maintained a strong navy and air force. Italy, under Mussolini, collaborated with Nazi Germany and contributed to the spread of the conflict within Europe and to Africa. The Allies, including Britain, later waged campaigns in North Africa and Italy before focusing on the liberation of France and advancing into Germany.
Throughout the conflict, Britain faced significant strategic challenges, balancing the threat of Nazi Germany against fears of the spread of communism. The British military capabilities and strategic decisions were crucial in shaping the course of World War II, influencing the alliances and battles that defined the period.