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After the capitulation of Axis forces in North Africa, Eisenhower oversaw the highly successful invasion of Sicily. Once Mussolini, the Italian leader, had fallen in Italy, the Allies switched their attention to the mainland with Operation Avalanche. But while Eisenhower argued with President Roosevelt and British Prime Minister Churchill, who both insisted on unconditional terms of surrender in exchange for helping the Italians, the Germans pursued an aggressive buildup of forces in the country – making the job more difficult, by adding 19 divisions and initially outnumbering the Allied forces 2 to 1; nevertheless, the invasion of Italy was highly successful.

What did the Allies invade after they conquered North Africa?
Sicily