History does not know the subjunctive mood. But this does not at all negate the now popular research on the topic: “What would have happened if?..” What would have happened if Hitler had invaded England? What would have happened if in August 1941 he threw all his forces into capturing Moscow? The history of the Second World War contains countless such “forks”, and their study is not at all a worthless curiosity. By analyzing the past, we create the present and change the future. “Alternatives” is not a textbook with right or wrong recipes for treating a disease that has already become a thing of the past. This is a challenge to think “about time and about yourself.” So what would have happened if Hitler had carried out Operation Sea Lion and attacked England? The authors of this book provide a thorough reconstruction of the “invasion that never happened.”