Saturday morning, flight trackers picked up a host of stealthy U.S. B-2 bombers that took off from their Air Force base in Missouri and headed west over the Pacific. It was a ruse. Hours later, a group of B-2s attacked Iran’s most important nuclear sites from the east, defense officials said, hitting well-defended facilities where giant U.S. bunker busters were thought to have the greatest chance of success. President Trump said U.S. submarines firing cruise missiles joined in the attack, striking other key nuclear facilities. The move allowed the U.S. to get its bombers over Iran faster and with a...