I just won the game through SpaceShip victory, but I decided to play a few more turns. I was the Persians and I looked and saw that the Egyptians and the Iriquois both had 3 ICBMs to my 16. So I decided to nuke them. But the nukes destroyed every other unit but the ICBM in a certain city.(I stole their troop plans) So can an ICBM be destroyed or was I just having bad luck?