Corsica was seized by the Allies in 1942. Taking Corsica before that means war with Germany when it rules all Europe and taking it afterwards means war with the Allies. Mussolini is having more than enough trouble digesting his territories. He's not only got the Slovenians to deal with (who are by far the best organised) but dealing with the Albanian, Montenegran and Kosovan minorities (given that they are in a poorer region with a weaker sense of identity, it's not as bad). This isn't even counting the problems with keeping order in Libya after it got swamped with a quarter million Jews in a year. Or the East African colonies. Mussolini has little interest in extra Italian territory right now. He's more interested in extending his influence and making Italy a great power. The fighting was too sudden to get the Haganah involved. Jews in Libya also desperately petitioned to volunteer to defend their bretheren in Trieste but the ships weren't available at the time. Now that the Italians have some breathing space (and they are on suprisingly good terms with the British government) there is a chance for far more cooperation in future. The next chapter will go into goings on in Libya. But yes, given that there is almost a Jewish state in and of itself in Libya, the Zionists in the Mandate are becoming extremely active there, organising various drives.