Direct aggression against Cuba would mean nuclear war. The Americans speak about such aggression as if they did not know or did not want to accept this fact. I have no doubt they would lose such a war.
Humans have always preferred to live their lives by daylight. I used to think it was because human beings have crappy night vision, and it wasn't until I got older and more cynical that I realized it was because they have less to be afraid of during the day.