Announcing a target or demonstration before hand would have also resulted in an all out effort by Japan to relocate POWs to the target.
It was that kind of a war for those unclear about it.
Unanticipated by the US was the disruption to communications from the Hiroshima attack. Reports were slow to filter up the chain of command due to the destruction. I'd estimate there was quite a bit of disinformation to sort out from what information was making it out of the area too. The general population that survived the blast could not imagine what kind of weapon destroyed their city; a common misconception was the US had dusted Hiroshima with magnesium powder which exploded from a spark from a street car. Their were physicians in hospitals that suspected something new and terrible had been used as all their X-ray film was fogged from the radiation, but they were busy treating casualties, and I'm not sure reports of fogged X-ray film would have made much headway up the command chain till some scientists could realize the significance.
It was that kind of a war for those unclear about it.
Unanticipated by the US was the disruption to communications from the Hiroshima attack. Reports were slow to filter up the chain of command due to the destruction. I'd estimate there was quite a bit of disinformation to sort out from what information was making it out of the area too. The general population that survived the blast could not imagine what kind of weapon destroyed their city; a common misconception was the US had dusted Hiroshima with magnesium powder which exploded from a spark from a street car. Their were physicians in hospitals that suspected something new and terrible had been used as all their X-ray film was fogged from the radiation, but they were busy treating casualties, and I'm not sure reports of fogged X-ray film would have made much headway up the command chain till some scientists could realize the significance.
The granting of a pardon is an imputation of guilt, and the acceptance a confession of it.